Sorry they couldn't get it fixed for you, but like I said in your other thread... when you get that short with the .45, it's going to have issues regardless.
I have a 4" and a 5" Kimber. Both run well, but every 3" I've shot or watched friends shoot have had issues with feeding. I really hope this one runs smoothly for you. It sounds like you've been thru enough to get a gun that runs.