Base pads for my 1911 mags - Wilson Combat 920 Series 1911 Base Pad

Unfortunately, after a few years of catching my palm skin when inserting the mag, I finally found a cushion to stop the blood blisters. The only problem is the attach screws prevented some of my 9 round mags from accepting all 9 rounds. This was somewhat random. I have a number of mags, about 1/3 only permit 8 instead of 9. I have not had a chance to break-down the mag for a possible fix.