I was looking at your bin files I would set intal timming to 0 degrezz and set the distributor to 0 with a timming light on any bin you are using. after you get your ve and timming tuned you might bump it up at the dist. a little at a time. I think you are running to much timming the 288 bin has burst knock employed the 7747 bin dosent. with that much timming the 747 is proble detinaton more than the 288.