I have had nose down ftf for over a year, and well over a thousand rounds. I have the new followers in all 4 mags. I have wolf 5% mag springs. I clean the mags after every use. I also spray Teflon dry lube in the mags. S&w polished the ramp and throat, I polished the lower ramp. I was using Winchester 230 grain target,and federal 230 American eagle. I was just about to give up, but decided to try 100 rounds of my carry ammo (federal 230 grain hydra-shock). The gun was flawless, for the first time.

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4516, shield 40, shield 45