The steeper the slope, the quicker you pick up speed. Everytime you move on to a steeper slope it's going to feel weird again since the increase in speed will throw you off. You're not likely used to the extra speed, so the first thing you do when coming out of a turn is freak out and try to abort because you are going faster then you can control.
It sounds like you have the idea of how to turn on both edges pretty well, so the next best thing is to get really comfortable on slope A and then start trying slope B. If the slope is steeper then you're used too, start at the top and make a frontside/backside turn on the fall line. At the end of the turn when you normally continue the S, come to a stop so that you are horizontal with the hill. Then make the next turn, stopping at the end of that turn, and continue this until the slope mellows to a point you can control. This method will give you a feel for controlling the extra speed without so much of the "too much speed, bail" scenario happening. Eventually you can avoid stopping between each turn, (still using a nice hard carve to keep your speed down) and then eventually you won't need to check your speed at all.
Get out there and just do it as much as you can, much of snowboarding is just about programming your brain to let go and let the body do the talking.
PowderHound and TreeNinja
Last edited by HoboMaster; 07-23-2011 at 10:19 PM.