I'm far from a hardbooting expert yet, but in my softboot carving experience, a couple of points of advice from Nick and Carvedog stand out as spot-on:
a) push with your knees, not reach withyour hand
b) look to the trees, not the fall line.
I never thought about it that way, but on the days when I was ripping solid carves, I was essentially doing both "a" and "b"...I just didn't realize it until you guys articulated it.
The other factor I've found works for me is the surface conditions. If it's packed powder, my confidence ramps exponentially. I don't fear washing out. As such, I push harder with my knees as I turn. Assuming the board holds its edge, this effectively extends your body (arms and all) up the hill, closer to the snow. My problem is that in the NE, ice is more prevalent than PP, so while I can hold a decent carve, I frequently don't find myself confident enough to push with my knees beyond a certain point, out of fear the board will washout. As a result, I don't get as close to the snow as I'd like. I have to work on that.