I never consciously push down my bars to countersteer. I enter the curve (turn) at a proper speed, look at where I wanna go, and the bike magically leans and I got to that direction. I practice my handling and get faster after each try until my next crash and then start over from there again. Not sure flaring knees help you. I watch good descenders like Nibali, Sagan, and Froome and see what they do. There's also a good Cancellara vid on youtube from 2005(?) TdF. Sometimes they stick out their knees sometimes they don't. I guess knowing the descent is also important. There's a fast downhill to where I live. I used to stick out my knee until the day I didn't and took the curve just as fine. But I have to say, it looks pro if you do it in style.
