I switched to the OEM plugs, and left the gap at .30 instead of .28 and ran them for a few months since the thread where I showed them all fouled for being 1 step colder .. My data logs now show a consistent +3 knock on launches. They may not foul but I am not entirely happy with them. Seems to cap my spark by a point or two which bugs me...
(caveat: I am too much of a perfectionist. I know the car can run 26-28 degrees so running 24-26 bugs me)