Regarding my Holley 850dp carb. I am currently running 82 primary and 80 secondary jets with 6.5 powervalves. If I screw the mixture screws in all the way it picks up rpm and likes it. Does this mean I should jet down a couple sizes? the funny thing is after a WOT shutdown the plugs look perfect with the mixture screws out 1.5 turns.. What's going on here?