I found that OEM grips are bit bulky for me, and decide to modify them. So, I mill them in a such way that the whole grips had the same thickness as on the top, something like 1/4". After that, I rounded front and aft portion, eliminating flat spot after milling.
Also, I didn't like fairly sharp edge just behind trigger. So, I took vacuum cleaner tube, wrapped a sand paper around it and made grips like this:
CAUTION: Go slowly with this modification. Check frequently how grips feel. Small amount removed has considerable impact how grips feel. Also, don't do any sanding when grips are installed on grip frame. You do not want to sand frame or a grip frame.
Grips felt way more comfortable, especially with heavier load, when revolver rotates upward considerably.