holley carb help,transition/stage

I do not run any power valves in this carb front or rear. Yes it does have removable air bleeds in the top. Thats part of my question, If I was to go smaller on the iab what else does that change,anything with the timing of the mains coming in or something anything else except richen this idle/transition circuit, or would increasing the fuel with idle mix screws also add fuel to this "cruise" 2000rpm zone or would it just be taking away from the transition circuit. obviously turning the mmix screws would have only a small margin before the idle would but a no go. Does my iab seem off would making a .002 even make a difference