I made my old pump gas Duster with the six pack idle on the outboard carbs with the idle speed screw on the center carb all the way out so the throttle blades where on the idle circuit only completely closed, not exposing the transfer slots at all.
I had the outboard idle mixture screws between 1/4 and 1/3 turn our from gently bottom also, my carbs where original 1970 440 automatic carbs worked on by C&J Engineering in Whittier CA, they took some tinkering with to make them go as fast as I could Six packs rule
Try it like you have it and then go up a small amount (.001 to .003 per jet) on the outboard jetting only until it starts to lose power due to being to rich
Let us know your results please