The reason why I'm looking for some grips is because the factory grip feels a little thin to me when shooting the 4566 single action. On my first range trip, I shot much better double action. With single action I was pulling the trigger with the first joint of my finger. I would say I have medium sized hands for a guy, so I was a little surprised that I had this issue. Of course, my shots are all left with single action. I'm wondering if the Hogue rubber grips will help. Midway has some in stock, so I ordered them.
I have a 5906 with the factory curved grips and shoot it much better single action. I think it is the double column width that helps.