Prototypes of moon drives. Super unreliable unfortunately.
Are you meaning when the motor rotates from applied electrical force, applied rotational force, or is it indiscriminate?
I am not sure on 6354s. They heat up too easily in my opinion but I only tried them on 12S builds. Maybe if you want to go the small motor route, consider reacher motors from Radium?
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Iron losses are mainly coming from two things:
Eddy currents - as the magnetic field changes next to a conductor, current will flow in the conductor - in this case the conductor is the iron core of the motor. Eddy currents are present whenever the motor rotates, you don’t even need an ESC connected. Losses due to Eddy currents should scale quadratically with rpm
Hysteresis losses - from my understanding these are the more significant of the two on esk8 motors. It’s from a changing magnetic field past a ferromagnetic object (the iron core) and changing its (the iron core’s) magnetic properties slightly. This happens at every rotation as well. Should scale linearly with rpm, at least in no load conditions.
With that said this is a very very deep rabbit hole and my knowledge only scratches the surface so take all this with a grain of salt.
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This would be the ideal weight for me
18s2p gets me about 10 miles
here’s what i managed to reduce my board down to, not including battery
About 6 miles range? Can you show the physical size of the lipos?
On a 4wd setup 10 miles is not too bad.
A 3p is good for a lightweight build. I have a 3p 40t it holds up pretty good and is light. This set up is epic. Super jealous you got your hands on the dwiii, looks fun!
I’ve got another one in the box. We’ve just not got around to putting it up on the shop. 
Yes, these are 2x ZIPPY Compact 6200mAh 6s.
After verification, I admit I have lied a little bit. It is rather 9 km to 3.75 Volts/cell with an average consumption of 15 Wh/km.
Can’t lipo go lower than 3.7v?
I would avoid. The lifespan of your Lipos will be affected. Also, on the same pack, the voltages of the cells get very heterogeneous. I mean one cell 3.70, another 3.75, another 3.55, etc. You’d better have another pack than going below 3.70 Volts/cell IMHO.
I usually stopped my discharge at 3.4v on lipos but had a longer cutoff window
3.7 is like nominal voltage. Definitely don’t go lower than 3.3 tho
Does that mean they have the rated ah between 3.4 and 4.2?
down to 3.0 unde rload is safe imo
it always bumps back up to like 3.3-3.5 once it rests
On lipo??? Definitely not. You’re damaging them at that point.
I wouldn’t apply the same rules from flight packs to these imo
I think the rated is from nominal to fully charged but I’ve never looked it up
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eh lipo is a funny one, on a sag 3v is fine. below 3.2v lipo has pretty much nothing left. 3.4v lipos just drop in power and voltage fast.
3.2-4.2v will give an average life span
3.7-4v will give a really good life span
some lipos will take any abuse and some just peace out on the first over discharge.
me and @Andy87 have used it, i’ve not snapped it but i would say 60amp per side is it’s limit imo
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lipos safe voltage range is 3.0-4.2