FWIW, the FTF SOUNDS (if the round is being lodged nose up into the TOP of the chamber as described) like a bolt over base malfunction, a mistiming between the slide and mag, which has more to do with spring rate or crap mags than feed ramps.
I HIGHLY recommend you have a smith look at it before polishing ANYTHING.
I HIGHLY recommend you have a smith look at it before polishing ANYTHING.