there is a book out about how to alter your bodies alkalinity. It might be a bit more than your willing to do. You could probably find it in a health food store if you asked.
Other than that, your doing what you can. Maybe someone here has a tip or two. Try rubbing your hands with baby powder before you play. I have seen that done by lead players for damping the sound of string
slides. Might cut down on the seat a bit too.