Well you have obviously done your research, and come up with the best solution to fit your needs. I was in the market for a slim .45, and I went with the CW45 over a Glock 36 (not interested in pocket carry though). I had thought about an AMT as well, but I couldn't find any locally to compare. With the .45, sacrifices have to be made when handguns are being made smaller and smaller. The spotty QC steered me away from them, as did the shuffling of companies producing them.
If I were you, I'd send it back in and get it looked at. If it still has problems, I would consider whether you feel it is suitable for self defense. I would hate to make a modification, only to have them hold it over your head as a reason that it failed.