[Tyson Schmidt]

The individual idle bypass screws are only there to synchronize the flow.

Disconnect one of the drop-links so that the two banks are separate. work on one bank at a time. Start by screwing the bypass screws all the way in. Now measure the airflow with a Unisyn or equivelent. The cylinder with the highest airflow is the one you will make the other two match by opening the bypass screws until they do.

Use the idle stop screw to set the idle speed, not the bypass screws.

now do the other bank. Once that side is even, you can now use the idle stop screws to balance the left and right banks, and achieve the proper base idle.

Now your idle mixture screws should have the normal effect. you should probably back them all out 2 1/2 turns from base as a default while synchronizing the airflow.