Okay. More updates. With Milspec on the throat the top round of a full magazine feeds more easily but that's about all. With a really tight grip, using 115gr Winchester Silvertips, which I happened to have today, I had about a 10% FTF rate with my usual problem, rounds jamming up against the ramp or at the top of the chamber.
To answer Sslater and Brendon's questions. I think I'm doing everything right. I am a fairly experienced pistol shooter and I have had practice with other small guns (P32, P3AT &PM9).
Two other shooters, both experienced but not particularly used to small guns, had far more FTFs than me, even with FMJ target ammo. One very good pistol shooter had no problem with two full magazines, twelve rounds, which may be significant but maybe not; I've made it though two mags at times. I'm not feeling optimistic about this right now. I can't believe my grip is that much worse than others'. Even if it were, how about shooting offhand? Weak hand? I'm getting very frustrated.