I find where and how your fingers pressure the grip will vary with the bow and grip.
Bows will have a different fulcrum point, and while I keep all my fingers on the grip with most bows, where I grip more tightly, and how tightly, varies.
I always do this when shooting a bow I haven't shot: let your bow arm hang fully relaxed, and let the bow find it's balance point on one finger of that bow arm. That's a starting point for me, and helps give me an idea of hand/finger pressure on the grip.