BINGO!!! I have the same set-up running 50/50 pump and c-12, 20cc 4mm domes, +6 timing, 35mm pwks, with 45 pilots, cel second from top, and 158 mains. I had 48s for pilots but responded like crap. Through in the 45s 1 1/2 turns out on the air screw and now it launches HARD in second. Go down on the pilot.