Ive been shooting a RIA 1911 and I initially had issues like yours which turned out to be a crimp issue. So I would definitely check to make sure you have enough crimp. On the rounds that don't feed properly, is the nose of the bullet getting chewed up by the feed ramp?
I would also play with the OAL a little bit. I found 1.26 inches to feed the most reliably in my 1911. Any reason you are sticking to a fairly short OAL? I found 1.26 oal with 4.8grains w231 to be a tame load that cycles 100% in my 1911.
With the gun unloaded does the gun cycle smoothly or does it hang up on that last 1/8 to 1/4 inch?
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