Man, I had an issue with some wadcutters and my 1911s recently, only to find that the damn wadcutters would not run in my G21 either. I don't know what I did with that batch of handloads, but it was wrong.
Otherwise yeah the above is my usual recipe for a good 1911 mag also.
Also, don't be afraid to try different mags, you can always retrofit the ones that suck. I have a few old CMC shooting star mags that gave up the ghost because they were 8 rounders that were 7 round tubes...so I placed a few super 7 kits from Tripp and they've worked perfectly as 7 rounders instead. They're incredibly reliable.
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