Thank you for the responses so far.

As I take turns holding my Ruger SA and the 625, I am thinking that if I get a grip that follows the frame (front and back) better at the bottom, I might be able to wrap my three fingers around the front of the grip much better, and allow the recoil to focus on my palm instead of just the web between the thumb and index finger. Right now, the predominant gripping force is close to the top of the frame, pushing against the web between my thumb and index finger.

Currently, I cannot get a really good grasp with those three fingers. I might also take the shiny finish off and use an oil finish, so there is a little more friction between my hand and the grip.

I don't know if I am ready to re-shape and refinish the original or the JM grips to see if my theory is helpful