massive reconfiguration time again.

AFBs
I have rebuilt many of them but never in depth tuning, plus the 2-4 i'm way off.
I can only speak holley,
many circuits will work the same or similar. holley power valve. afb metering rod spring weights.

How far are you off from the main jets that came in them carbs from the factory? This may give you a idea how far of you are.
Its apple to oranges when i come to the front main jets as there is a metering rod that has a major effect on cruise jet size.

I think i would put a smaller ............
someone that tunes these AFB need to chime in. i could say something that easily make sence but it just not the truth when it come to a AFB.:(