Frank,
I had to shim mine to tighten it up on the 97 as well. I think there is some variation in the dovetail of the guns. I had to file the one I put on the 75B slide last week but shim the one on the 97. The P-09 was just right. Be sure and snug down the fore and aft set screws as well. I used 0.002" shim stock, I think. If you can get it tight once, it will be good for a long time.
Joe