For the folks who have experienced FTF's with their Glock 29 while utilizing 15 round Glock 20 mags, I may have developed a workaround. From my examination of mags, ammo and barrels, I believe that the problem lies with mag misalignment caused by a group of factors. The extended mags, XGrip spacers and the way certain shooters grip the weapon work together to cause a slight mag misalignment during shooting and cycling the weapon. This misalignment tends to cause random feed problems. About 3 wraps of electrical tape on the mag right above the XGrip spacer worked perfect for me. Took out all the mag slop in the mag well and upon testing the weapon with the "taped" mags, not a single FTF. Hope it helps someone out there!

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I have a G20sf that Im wholly disgusted with due to FTF. I may have to examine it from your angle. Hopefully!