Smat thing I do. Goingright, I turn my right knee out (same with left). Read a few years ago it helps the turn. Actually catches the wind like a sail to aid with the turn. If that aint true, maybe it's the pointing that helps but I find it helpful.

IMO, descending well enough/fast enough is good enough. You don't gain enough time on the descents, not worth the risks.

I do have a ride partner that was sketchy on the descents. I'd easily leave him behind coasting. So he started following my lines and technique on the descents. Now I have a hard time dropping him while pedaling.

Learn to countersteer and use the knee.

I was hitting 40 max here. You can see the car gun it (puff of smoke) when I catch up on the descent.

Practice helps but for safety reasons, I rarely push it down hill.

My fav DH video.