A hand gun grip needs to fit your hand like a shoe fits your foot. It's either ok or not ok. I mainly have this problem with all my ruger handguns. My Colts and s&w handguns fit me perfect. We need a tight fitting grip that fits our whole hand comfortably.

I had a custom pair of heret grips made to the size of my hand drawn on a piece of paper and sent to heret to make them. My ruger security six fits my hand exactly. Maybe that's the answer to your problem. The smaller grips the gun tends to rotate up in my hands with Magnum loads.