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.
Sucks to hear this. I've been running COMP products since the 80s and never had a quality issue until I bought the last cam in 2013. Three bolt solid roller. The issue was that the cam sprocket bolt holes were tapped fine thread instead of the coarse threads it should have had. I called COMP and they blamed it on the company that produces the cores for them. I asked if they QC them and the reply was yes. A little back and forth with them and I was left wondering if they missed something as obvious as that, how good is the QC at COMP? Once these company get bought out or turn into a conglomerate quality takes a back seat to volume and profits.