With regard to gear, which I should have mentioned. I'm trying with a normal board that I handle well with softies - and trying it with my hardboot. An O-Sin 3800, TD2's (probably stiffer than ideal) and Raichle SB324s.
I have my eye on BTS, but have vowed not to buy any more gear until I can get over the hump and can carve tighter radius to control my speed on steeper blues with current equipment (old school Donek FCII).
From what you're saying, it sounds like it might be a good idea to try some lower angles. Running 50/45 range now (vs. 30/21 softies). I'll try dropping it with a little more splay and see how that feels. I have 3f/6b cants turned more for lift than cant though. That's a good basketball analogy Ian-M... seems to make sense.
Beckman, I'm not sure I understand what you mean w/r to the pivot, but lemme see if I do. I think there are 2 modes I ride bumps in. One is firmer more skier shaped/rutted bumps, in which I am heavily front foot weighted. Still initiating turns with the board edge though (not flicking) and the rear follows. Is that what you mean by pivot? The other way is softer bumps where I'm more balanced weighted and rocking the board and surfing around them - almost like the cross under drill. This is how I'd ride typical tree lines, and is the most fun mode of operation that I'd really like to get comfortable with. I can live with skipping the rutty bumps. I was interpreting ankle articulation to me dorsiflextion/plantarflexion (not that I had to google it of course!) - but maybe that's what you're getting at - it's a combination with hardboots?