installed samson rolled thunder slip-ons on 2002 flht and changed slow jet to 48. still pops once in a while but getting alot of backfire on deceleration. from what i read, bike still too lean but looking at pipes, somewhat black instead of brown. should i adjust idle screw out to 2 1/2 turns, believe stock is 2 turns or should i change main jet? any info would be appreciated. by the way the pipes sound excelllent.