currently i have my lid off with stock filterand exhaust with sparky out. before i was running lean. now with the dobeck adjusted to 4 6 7 6 .. it runs pretty good, noticed a gain in power. but my plug color is still a white color, maybe a very light tan color. now are my pots on a lean side??? or is this color ok and will i gain much more but fattening it up more?? new to this game so all the info will help me .. thanks guys.