Yeah, they make a lot of clunking noises.
The main problem on mine was the top shock eyes in the rear. They had become oval from the angle and which the force hits it. Cuz of the backwards mount angle.
Even if it’s just to get familiar with it, tear it down and inspect all the joints and wear-parts. Give her a good clean.
As for turning, they do take a good bit of heel-toe pressure. When I carve, my weight is either all on my toes, or standing on my heels. I found that it’s easier to ride if you ride it like a snowboard.
When you carve on a snowboard, since you’re attached to it, you have to lean your whole body up onto your tipy-toes, or you rock back onto your heels.
At first, I had a hard time turning my Endeavor too, because I was trying to ride it like a skateboard. If that makes sense!?.
I use a different style (stance, center of gravity, carving method, etc…) when skateboarding vs. snowboarding. Once I started thinking ‘snowboarding’, it all clicked.
What I did to get comfortable, was go into a big empty smooth parking lot, and just did circles and figure 8s as tight as I could. I’d turn frontside and backside, leaning as far as I could, before falling off the board…
Also if you need to turn quick, stomp you back foot…
Like, to turn hard left (if your’e not goofy foot), lean back a bit and kinda stomp down with your back heel real hard. The board should want to turn pretty quick.
Also if you’re on a loose surface, or grass, you can burp the throttle in a turn and drift it a bit to turn even tighter… Combine the 2, and you can do donuts!.. 
I also discovered that I carve in 3 different ways.
1- I lean at the waist and kinda twist my body. Losta work, hard to carve.
2- I bend at the knees when I cave. Kinda like doing a small squat, or sitting/standing from a chair.
3- I kinda stiffen up my whole body and I juts pivot back and forth at the ankles.
4- For off road; bent knees to absorb the bumps, and pivot at the ankles using the Stomp technique.
An important thing I learned about the Endeavor pivot system too, is that it get softer past a certain point… Its hard to explain, but once you lean past a certain point it gets softer, like it keels over…
Think of a compound bow; hard to pull at first, but once you pass a certain point on the cam, it gets easier. Similar principle here.
So, if you leaning too much in a turn, you’ll pass that point and it might feel like the board wants to dump you off the side.
Don’t step off, don’t slow down, give it a bit of throttle.
It sounds weird, but if you speed up a bit and the centrifugal forces will kinda stand you back up past the “keel” point and it’ll feel stiffer again. Makes it easier to regain your balance.
Hard to explain in words, but hopefully you’ll feel what I mean.
Anyway, I’m rambling.
I posted a video in an other topic.
Watch the last video till the end and you can see what my feet are doing. Maybe it’ll help.
this is on the stock bushings, i didn’t even adjust them out of the box.