[SAJ]

Ericr. That is what I was referring to where I said "where your GAV needs to be set depends on the flow rates of your particular jets".
Running mixture is governed by main and compensating jet flow rates etc, , with fine tuning by the GAV setting depending on altitude, petrol quality, air cleaner restriction etc etc.
If closing the GAV right down does not result in a lean-enough mixture, then jets need recalibrating by replacement, soldering up and re drilling etc.
SAJ in NZ