Dude, awesome! I couldn’t find that post but I was really certain someone has asked nearly the identical question before me, and I guess that was true. Thanks for posting the link, I’ll read through it carefully and hopefully the solution is buried in there somewhere. I would also appreciate answers to this thread as well, so anyone interested in posting should know I haven’t solved it yet.

Any tips on how I can search the forum better to find previous posts on this kind of question? Would using a timing light indicate how much real knock retard there actually is? My data output shows ~15 degrees spark advance and ~25 degrees knock retard, so would a timing light show ~10 degrees of ignition delay if the knock retard was real?