I had to qualify with a 1911 as well. Worn seer, Extractor malfunction, misfeeds... you name it. Shot expert in all my practice sessions, but not on qualification day.
I own 2 1911’s now and I shoot them far better than anything else I’ve tried. The condition of those Navy/Marine M1911’s back in the late ‘70’s was pretty poor.
I love everything about my SIG 1911. But it ain’t a carry gun. It lives on my nightstand with the safety on and one in the pipe. For some reason, I shoot better with it than any of my other stuff.