The go-kart guys really squeeze the lows because they don't care about transition. They run wide open all the time. We need the low to be smooth and reliable. Still sounds lean on low to me. Not sure I understand the "loading" on an upline though. Anyway, when the high is tuned right you should be able to pull straight up at WOT and never loose RPM and the plane should go out of sight. Again remember the low does affect the high. Also remember that the engine will lean some in the air so a little rich on the ground may be perfect in the air.