A hint is Larry and the other poster's (he used the Wilson Service, which is a tapered lip hybrid magazine made by Checkmate) use of tapered lip magazines, the originals John Browning intended to be used in the 1911. These let the rear of the round riser higher in feeding before it is released, giving the round a straighter shot at the chamber than straight lip 1911 magazines, which are really nonstandard. The case rim is also at less of an angle to the extractor when it feeds straighter, which improves its chances of getting there.
Most of you are using the wrong magazines for 1911's and don't know it as whatever you have was hawked to you as the "best" for the 1911. The "best" was what John Browning intended, which were tapered lip magazines. This same design has the best chance (chance....not guarantee, as you're pushing the envelope in running these through a rifle) of feeding.