I think you need a lower compression piston try SRP pistons they are the same as JE but they aren't polished where the wristpin connects so they are cheaper but same qaulity or Summit racing carries Arias pistons . Try www.raceeng.com. Try lower heat range sparkplugs such as Zex. Retard your ignition timing. And check your air/fuel ratio with 6 pounds of boost you shouldn't have screwed your engine up so bad. Also get some connecting rods try Eagle they are really good, since you have the engine in pieces work on the head get a Zex cam. They emphasize on duration so you get good exhaust scavenging. I heard that you should stay away from Crower i read on some sites where there cams have broke. Plus they are expensive.