Hey guys, thanks for the responses so far. For me I'm 6"1, 230 and ride a 163 Legacy set at +18/-15.
I'm definitely going to have to look at shoulders and alignment, as I know when it usually happens I might be a bit out of whack. Thinking about it my shoulders are usually twisted a bit open so that I'm looking downhill, same with my hips I believe.
I've been trying to stay on an edge - no matter how small - just to keep it from happening so I'll pay more attention to my form tomorrow and see what happens.