Right on, congrats on getting this resolved. :thumbsup Sounds like the problem is on a very short run of AEM rotor hats that have the centering lip? I have the newer slotted design, but no lip. AFAIK, AEM only sold the slotted design for a few months before selling it to Powerslot.

IMO, sell the AEM replacements, unless you haven't installed the Race Concepts rotors yet either. You'll get more on ebay for a brand new, big name part, than a used one.