Cam lobe going flat...what now?

.545" lift, eh? XE285HL? Comp Cams? Note.......the lifter is wider than the lobe face. So.......Good bet there was nothing wrong with your break in process. I have found many flat tappet Comp Cams over the past few years where the casting flash between the cam lobes hasn't been removed and the cam grinding process isn't wide enough to grind the flash so that the width of the lifter clears the flash. I used to send the cams back........and get a new one the same way. I've taken to inspecting each cam and grinding the flash between the lobes with a die grinder and a thin 3" diameter cutoff wheel.