I assume you've tried rotating your top hand over a bit ?? That can also really wreck a swing "worse" ... Same with stance adujustments. I'd suggest closing the clubface slightly at address, then work on coordinating the "rolling" wrist through the shot ... trying to "picture" the slice being caused by "blocking" the ball in softball-type swing -- while a straighter shot (or draw) will happen if you work on bringing that top hand over (subtly) as you complete your downswing. Or ... just "play the slice." ;-)