Difficult to imagine that an eccentric aluminum journal would wear the cam to this extent. At the very least, I would expect the journal to be nearly destroyed by the time there was significant shaping of the hardened steel of the cam. It's only an educated guess of course, but I'll bet the cam was slightly OOR from the gitgo. A runout of .11mm is huge. You no doubt were losing the oil film between the cam and journal long ago. The wear was probably accelerating rapidly over the last few hundred miles.

Regarding the head in the other bike, you might want to take a good look since running the bad cam to see if there's any scuffing on the journal surface. Aluminum is probably as good as any other bearing material, but an oblong cam will chew it up in a hurry.

Sorry you're having these problems.

Jack

'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy