I feel you hackpro, i think a lot of good golf players have this tendency, I do it sometimes too, and some times it could be caused by giving up on he shot, follow thru with confidence, a lot of times when you dont it leaves the club face open.
But i hate hate hate that feeling u get in your hands when you S, the club immediately folds up to the left, it does a quick twist in your hands and ur grip looks like ur doing this hardcore strong grip.
it used to bother me when I S. but what i do is I go back to the basics, just half swing and follow thru with confidence i try not to think of it.