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You mean 96A / harder bushings ?
I have a 90a set right now
I can sell you a 93 set if you like…wishes can come true.
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yes plz
I want whatever @Pecos ran. I think 93a Bs all around
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I think these 93A’s are great 
I’m going for some runs on 96A’s coming week, thinks these are way harder and more suitable for stable fast riding.
Loving the 93a double Bs. Cant get enough of them. Just absolutely amazing. Stable and just the right rebound and rtc. Still ruining my other rides. Feel like i got my cake and eat it too.
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I’m about 175ish. I wouldn’t think 5-10 lbs would drastically impact performance. At that point it’s more about preference. I can’t imagine 90A feeling stiff to you.
But I ride with bindings, which would be one of the biggest variables in my opinion. Riding without bindings definitely lends itself to looser set-ups. The main thing for speed is in my opinion is decreasing the angle of your back truck which you’ve already done. Let’s see what Brad thinks…
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Personally I think 90a will work best for a 170 split angle setup. With the current 4 bushings, you will have a wide range of choices to work with between shape placement and preload bias.
Safe is subjective and relative to your skill level, and like I said, you have a wide range to tune this system.
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I just had a ride with 96A (grey) B in front and D in the back for a ride on the FLuxMotion giant heavy board which has bigger wheels (so more high stance from the asfalt). This feels great for speedy ride + stability , not so much fun taking a fast turn/curve… although if you do your best , put some weight into it, it still turns better than the normal MBS bushings.
Might have another go with 96A grey C2 in the back to give that setup a try.
I think the 93A (wine colour) are going to be my all round favorites, with the D always in the back , maybe the C2 on the lower deck i have. These are some game changing bushings. Love em
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I like loose and low angles for a more lean per turn feeling. There are two schools of thought on traction and in mountain board/at pneumatic wheels used on street eskate the trend is for absolute traction - never break them loose and as sticky as you can. The low angle on very loose setup makes carving and pushing through turns feel good to me because i can put my hand down but not de weight and really relax into the weight shift and movement.
If the angles are too high the turn is done before i can even get low and im vertical the whole time turning from ankles only. Im running 93a b shape at 30/20 at 180-190lbs depending on the season. I don’t ride bindings, just very aggressive frit.
At low speeds (under 20) the extra lean because of the low angles is a little much for some but i find it manageable and fun. 20-40mph the low angles feel solid in straightaways (with singularities not on stock bushings) and still have enough fidelity to make big carves and feel reactive under your feet.
I can see keeping more angle for a board you want to be able to slide - having more turn per lean lets you break the rear free to coleman or do little speed checks. This is a different school of traction - here you are trying to get exactly the right break away and less lean likely helps there though i suck at and am still working on m downhill skills.
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The deck height from the pivot point is also an important factor. The Colt decks with the shallower angle are actually meant for the ATS.12 trucks that are more of a TKP style and include some pivot angle in the truck, AFAIK. I’m currently running one with a 15-degree wedge for extra angle in the front on Matrix 3s. I actually like it a fair amount, but the result is that the standing platform is a bit higher compared to the truck pivot than it would be on something like a Comp 95. Being higher above the pivot makes things more responsive and/or twitchier depending on your perspective. I think you can counter that out some with harder bushings, but I’m not completely sure what the tradeoffs are there.
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As the other guys mentioned, the Colt type decks (20 degree tip/tail) are paired with ATS trucks which have ~30 degrees built into the truck itself (TKP style). So they’re actually at 50 total which as you know is on the high side (very turny).
The MBS Matrix trucks don’t have any angle in the truck itself. It’s all deck.
The rest should mostly match what you know from longboard apart from potential differences in wheel base which can be significant.
My personal experience is that channel trucks require a bit less total angle to perform similar to their skate bushing style counterparts (TKP, RKP). I don’t have a great explanation for why exactly, but my experience is that 30-35 degrees on channels might be similar to 45-50 degrees on TKP, RKP style trucks. Thinking it has to do with the fact that skate bushings serve dual purpose resistance and constraint. Maybe the extra precision of channels eek out a little more truck turn per degree of deck turn? Mostly anecdotal.
For maximizing turning AND stability I’m a fan of high degree front trucks / low degree rear trucks. Speed wobbles come from the back. That’s probably not controversial. That’s why cars have all their steering in the front and none in the rear. It’s a different feel though… I personally prefer balanced set-ups for matrix (i.e. 30/30), but if I wanted to push speed without sacrificing turn I’d go 45/15.
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Nailed it.
And yes, I just suggested 15/45 as an alternative to 30/30 because of the 15 degree riser we sell.
Have fun!
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Love your MBS angled risers, great engineering there 4 sure!
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@ me next time 
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What I meant is that I’m not sure about what the overall difference is between riding with a higher deck and harder bushings vs a lower deck and softer bushings, but I think there is some. I just haven’t thought through everything that it does. I’ve been wanting to make something so I could mess with deck height without changing anything else about the setup to see what happens, but I haven’t had the time. I also haven’t really tried to logic out the physics of what is actually going on, but maybe I should.
I do not agree with this. Stiff does not equal stable. Most DH setups can carve a 180 in a single lane at low speeds without sliding. The key to all of this is a front that turns more / easier than the rear.
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Never, actually, I detest flexy boards, as well as high degree trucks for DH and when I do ride them, I ride them loose and do a lot of speed checks. Risk must be managed.