I once owned a Springfield P9(CZ75 clone), and I also installed Pachmayr rubber grips on it, as they were the only aftermarket grips available at the time(1991), and I didn't want to get the original wood grips scratched up from carry. As I remember, if I tightened the grip screws all the way down, that made the grip panels bulge into the magazine well and drag against the side of the magazine. There would also be a slight gap between the frame and the grips around the edges. I just backed the grip screws out until the grips fit flush around the edges again, and the mags would drop free. Try that, and if it works and you still like the grips, get a small bottle of BLUE(low-strength) Loc-Tite thread-locking compound from the hardware store and put one drop on your grip screws, then re-assemble and re-set your screw depth as before. ABSOLUTELY do not use RED(high-strength) or BLACK(permanent) Loc-Tite, those screws will not come out EVER unless you take a blowtorch to them if you do.