Holley/Demon Carb stumble

The idle and main air bleeds in the demon are 8/32"x 1/8" you can buy brass set screws and drill your own. Smaller idle bleeds will fatten up the transfer slot mixture. I run .066 idle bleeds on my car at the track, .070 on the street. To lean on the idle circuit hurts the off idle transition. Next is the pump nozzle, do they immediately shoot fuel when the throttle is moved? If your running pink cams they are to slow. Try a blue cam up front if you have one.