Carb experts Please help

Engine package is a 70 340 + .030, J heads, comp 284 cam 240/246 507/510, 750 Q series double pump. Engine is timed at 20 initial 34 total.
Carb seems to want to run rich all the time. Dropped the jets from 74/84 to 70/80. The idle mixture screws are barely open. I changed the air bleeds from 36/70 to 39/75. This brought the idle speed up and allowed me to get a better idle. But still the mixture screws are like 1/4 turn open. Does this sound right? Is there something else I should try to get the mixture screws farther open?