If it really is an issue,, a POLITE call to Ruger may get you a new set of grips. But w/o the gun, they can not assure a good fit. I own several Rugers,,, and due to varying tolerances,,, occasionally we do see poor fitting grips. In my case,,, I just go to my "spare parts" & look to see if I have any grips that fit better. Of course,,, I've been buying spare parts for a long time, so I have that option.
If you enlarge the grip pin locator hole in the back of the grips,,, you run the risk of the grips slipping around on the frame as they are not "locked" in place.
The BEST option is to have a set of nice custom grips done by a grip maker to fit your grip frame. You send the g/f only & they fit a nice set to it.