Kris there's a thread at MSEXTRA running with a log and msq here:
https://www.msextra.com/forums/viewt...?f=131&t=75049
He told me hes tried both edges, but I'm not sure if he has since shielding the signal wire. The symptoms do sound like what you mention. In the log it runs good til 51xx rpm then loses synch. At a little faster rpmdot it loses it 7 times quickly on the way up.
ETA: Kris, the Holley sensor he's using is mentioned by part number in that MS thread. Do you have any experience with it? Is its built in pull up compatible as is?