RE: Is the bottom end too lean?
Ditto. This is basically the procedure I use, work very well. Would like to amplify. Be sure your high side is set before you mess with idle mixture. On the roll up to full then back (Step #1) don't bang the stick, roll it up over 1 second, hold for 3 seconds, then pull back to idle over 1 second. On #2, sometimes a lean engine will not instantly die, i.e. you get a quick partial spoolup of maybe 1000RPM then it dies. Be sure to perform the idle test with a warm engine. Cheers.