I got my T5's, V Force 3's, cool head with 20cc domes, +4 timing advance. I pulled the plugs after a little riding time and they are a little black. They aren't wet but the ceramic is totally black, should I leave it or should I tinker a little bit? 280 mains, 4th clip, stock pilots, and 1-1/4 turns out on the screw. It runs great but just wondering if I would gain anything out of it going a little leaner than it is. I also don't want to be changing fouled plugs all the time either. Thanks for any input.