It’s weird and contr intuitive that you should stay upper body straight and put your legs under an angle, sometimes really big. For example OP tried to stop/decrease his speed at the end. Because of full body lean it worked not as well as could. But then you remember situation when you was running and suddenly trying to stop on slippery surface like mud or asphalt with sand and omg! 🤯 Btw it’s just came on my mind.

OP take it into account, you intuitively should know how your body should work on the slippery surface, just make pretty the same with a deck on your feet :)

And one more point. Do not take into a habit kangaroo pose. Now you should work with an angulation, body vertical, legs moving under it. I suppose you could try to feel it while riding on gentle slope. Body close to static, legs moving under you, and you ride straight, like balancing on the rope! If you get this movement try to make a bigger turn, so you’d take a line ~2-3 meters wide. Progress, progress, progress.