this fetal position you speak of, is it all the time or just in the bottom of each turn? I notice, especially when carving on my soft setup, that on steep terrain that I really have to drive down into the board to hold a carve. If I bottom out (get to fetal position) before I finish the turn I will lose an edge. the steeper the terrain the more up and down my movement gets.
Any comments from the jack would be appreciated as well. I know for me I sometimes have trouble translating what I read here into actual action and I have a hard time describing what it feels like when I am doing it.