When I picked up my Slammer from bowyer Leon Stewart, he knew I had been shooting a recurve. He suggested that with a recurve you want to use as little influence as possible on the bow, while a longbow likes a firmer grip. That seemed to work quite right for me. You’ll see that repeated in different shooting books, offering the best way for a recurve is a high wrist.
I tend to use a fairly firm grip with my index and middle finger, keeping my palm heel down on the handle, but I don’t hang on with a death grip by any means.