I started searching "polishing P320 feed ramp" last night also as I was considering polishing mine. It seems that they did switch over to the coated ramps and the general consensus is that it doesn't cause problems. I had loaded my two mags that came with the gun at least a day and a half prior to my first outing and had one FTF out of all reloads (230 grain PRN) fired. This was with the pistol not cleaned prior. The second time out I had no issues with 80 rounds. I plan to let mine wear in and not try to remove the coating. I suspect it's more of a magazine thing than barrel issue.
My concern is changing the ramp geometry as that coating is tough stuff. I'll wait certainly until I hear hear how yours does...going to school on Confused!