I always set my high speed first for 2-3 clicks rich side of max RPM with the nose up. Then when it is good and warm, I set the low speed. That is the tricky part and I would bet your low speed is the problem. Set it for a good idle, then tip it up at a 45 degree and listen. If it speeds up, your lean. If it runs rough and stalls your rich. Richen or lean your low speed in 1/8 turns until the idle is pretty smooth at 45 degrees nose up at idle. This will get you in the ball park or will be the end of adjustments for an air bleed engine. Then I fine tune my low speed for the flying that I am doing. Transition from idle to max and listen, if it hesitates or skip as it transitions then it might still be a little lean. Richen the low speed in small increments for a smooth transition from idle to max throttle. You'll know when you are there as it will transition smooth without any hesitation. If you go too rich you should know by lots of discharge from the exhaust and lots of smoke. Even farther to the rich side and so much fuel will put out the glow plug. If I have a Sport plane I even check my transistion while in the vertical(simulate a hammer head stall and make sure it won't load up or stall) and fine tune the low speed.