I think Larrys heading you in the right direction.
Keep in mind doubling up on carbs decreases signal strength seen at the boosters.
If you dont have data logging, a video of your AFR meter during a run can help.
If you have an AFR meter and it has an analog voltage output, you can connect it to a volt meter(non digital readout) and mark the voltage it reads when you are at your desired AFR(tape/paint). Mount it where you can see it easily just as you would monitor fuel pressure. IMO easier to read quick vs LED which might be flickering at time you look at it. The NGK AFX fuel meter has a 0-5 volt DC analog lead you can connect to.(It corresponds to AFR) I dont know about the other AFR meters.
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