My thoughts....
I believe that if the tank is filled to a level above the carb you can run without a pump.
So you could try bypassing the pump, run awhile without it and see if that alleviates your oil overfill issue.
If it does alleviate, your pump is the issue, if not I'd look at the carb float, needle, etc.
I'm thinking 1-3 psi would be a better option.
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