Since i added the port fueler kit to my srt-4 I have been detecting knock starting from 1 lbs of boost. My air fuel starts at 11.4 and ends a 9.9 afull boost. I does it with all types of gas (no race gas yet). ( full boost is set at 19-20lbs. even at lower boost it detecs knock. Plugs look good after all runs. Any ideas??