QuickFuel 880 Surging/Missing At Wide Open Throttle

I went through a situation like this with a quick fuel 450 dp carb. No matter what I did to the idle feed restrictions or the idle air bleeds (im using a wide band) just rite off idle into transition it would go off scale (16.5-17.8) lean until you got past it or low enough vacum to trip the power valve then would fatten up & be ok. Until the throttle went rite off idle again (cruise) sent it back & going to re bush throttle shafts on my afb & be done!