you on the right track. For me doing the pinch and trasition tuning of the low end is a simple way to convey how to get it close, it's also quick and fool proof. I get it close this way in a minute or two

Once it's "close" yea your within a half turn either way on the low end. Then I just basically play with it , nudging the idle a few degrees either side until I'm happy. which takes time, 10-15 min. The hard part for me is figuring out if the engine is broke in or not, and really hard when it's someone elses asking me to help and not knowing the history of the motor.