I have '95 3500 5 speed with a #10 plate and straight exhaust. I had my timing set last week to 15. 5 and know I have less black smoke. Before I had it timed you can make it bellow out pretty good. Is it normal to have less black smoke with advanced timing? My star wheel is pretty much all the way turned toward the passenger side so the wheel is closer to the front of the truck. What ya'll think?