proform race carb / Idle trouble

larger number pv is needed. the cruise vacuum is keeping it closed to long. a pv closer to the cruise vacuum will open sooner when the signal starts to fall. let's say you have a 3.5 pv and you have 12 lbs off vacuum at cruise. when you crack the blades open the vacuum starts to fall off but because the pv is at 3.5 it take longer for vacuum to fall off to under the 3.5pv to open it up.