I see very little here about tank location which would be important in the case of idle but not always full throttle . if its a long way to the tank or its very low that can affect the length of idle. also it is not always neccesary to adjust high speed after dealing with the low speed. .depends on how far out of adjustment & "sync" they are with each other. very seldom are they perfect anyway.as stated before SOME airbleeds have very little effect , other very noticeable . often depends on the mfr. 1/8 turn on some air bleed carbs ive seen had little or no overall effect. the airbleed carb is actually a rather simple crude affair compared to the two needle types.