Just to throw in my 2 cents and maybe some salt on any wounds....
My springer loaded had some FTE and a few FTF issues with any ammo from start all the way to approaching 1000 rounds. Sent it back to SA; they "modified" the breach, replaced the extractor, tested it, and pronounced it good. I got it home and was still having some issues. I went to the 1911.org and stated my issues when along came Tuner and suggested mag springs be replaced. (I had been using the factory mags, Chip McCormack, and Wilson Combat). So, I replaced the mag springs in the factory mags and have had zero issues since, using both FMJ and JHP; all 230 grain.
Now, that said, I just told you everything I know that worked for me. May not be the same for you, and I am the first to say I am no expert, just a rambling contributor to this post.....
I'd say get a bunch of FMJ, give that a whirl, and see what happens.
By the way, SA did offer to take mine back again and they paid shipping the first time and offered again the 2nd time - so I am pleased with their customer service.