Agree on the mag issue.But OPs problem does not read like it's break in related. It reads like a magazine issue.
To the reason for my post ... 1911s perform best when the shooter uses a firm hold. I submit that many break in issues are solved by shooters developing an appropriate grip.
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I have intentionally tried to make a 1911 malfunction by using a loose grip. Just enough to avoid having the gun fly out of my hand. Never could get a malfunction.