Thats pretty much what i have been figuring. My idle a/f seems to change constantly, one time at idleits 12.x then 13.5 then 14 then somewhere else, this is without changing the screws. I now have 62's in the primary and under light cruise its around 13, then under slightly harder cruise and acceleration its right in the low 14 range about 14.2 14.4. The secondaries were running right at 12dropped them down from 72's to 70's and its right in the 12.3-12.6 range. thats what you shoot for at WOT right?