Strangling the baby bird
Sam Snead suggested that the way to visualize your grip when you're getting ready to swing is to imagine you're holding a baby bird. Poor baby.
When I start, I picture a little sparrow nestled under my right hand. By the time I'm done with my followthrough, my grip has squeezed it into an infant ostrich.
As a result, I'm going to the two (center and ring) finger grip with my right hand. That should ease my pressure on the sparrow. If not, I'm turning it into a dead duck.