I polished the feed ramp on my P3AT in a few minutes with Q-tips and Flitz.

Find a load that's 100% reliable in your gun by putting 100 rounds through it without a stoppage of any kind. If all you can find in enough quantity and/or afford is FMJ, then run FMJ. FMJ isn't what I like and 147 gr. isn't either, but you have to run with what the gun likes.