Idle is EASY.......you adjust that in the garage before you do anything else.........Then you go out and make POWER pulls to get the overall main jetting correct. Drivability would be the last concern...........BECAUSE, the power is going to require the main and high speeds to be what they have to be. Then you have to MAKE the drivability work with that jetting. Plus, chances are very good, that IF you get the idle clean and the WOT right, cruise will be pretty darn close. And most racers at the track could care less about the midrange anyway, because you never see it. In the pits you are mainly idling around on the idle circuit and everything else is wide open. Midrange only matters if you cruise the car on the street

But none of that changes the fact that to "read plugs" you have to make power pulls, click it and look at them. Don't matter if your idle and cruise is considered PERFECT. A power plug reading after driving or idling is JUNK.

Monte