low speed idle enrichment screws not having any effect on how it idles means your idle circuits are still plugged.
Back in the Ultrasonic Cleaner with a couple tablespoons of Pinesol and hot distilled water. Turn on the heater for the Ultrasonic.
15 minute interval cleaning cycle. Being careful to not have the mix too strong and or leaving them in too long, or it will turn your aluminum carb bodies gray. No coming back from that either.
Blow air and run small parts tag wires through the idle circuit runs. Make sure you can feel air coming through the ports in the throats when applying compressed air to them. Finish out the ports with carb cleaner and compressed air.
Polish up the ends of your idle screws with a scotch brite and be sure they are not bent.
These 2 screws regulate how much fuel comes in at an idle.