How about this for an idea? Cut your starting load down to 10% below listed starting load (@ 4.5 gr.) at your desired OAL and increase charges 2 to 3 tenths-of-a-grain til gun functions how you want. That's called "working up" a load, a concept that seems to be lost in this day and age. I'm guessing you'll get to fishbones' load and have room to spare. And 1.240 or so is what I load with 230 gr LRN in both my 1911's.
BTW, loading dummies to check for function doesn't necessarily tell you what happens when you actually shoot the load.
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"I should have picked alcohol, drugs, or beating my wife..."
Pete Rose
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