Turn ignition a bit later. Maybe detonation sender is gone, who knows. After 3A was installed in my former A80, I had some problems with detonation and something like that "flatspot" thing, only in lower rev range, so I slowly learned how to properly adjust ignition for that engine and after new detonation sender was installed [old one was with cracked plastic shell and wire wasn't in better condition] and ignition properly adjusted [by feel] there was no problems with ignition thereafter.
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