heavy bog under acell

Okay so I did some tinkering with the car this weekend, most of the bog is gone now,(slightly bogs now) I put a 7.5 pv In, however I think that is too high, because after I let off the throttle from wide open, it takes a little for the rpm to some down, drives like I got cruise control, there is no binding with throttle linkage, so my guess would be pv hanging open. (Now i know this is the wrong way), but I connected the vac advance to manifold vac, noticed that the rev at idle is alot more crisp. So my thoughts would be adjust timing? Currently timing is initial 10* btdc 34* btdc @3000. If I set base to 20* the idle is cleaner vacuum is higher, but with a 24* mechanical I end up with way too much timing. I have verified true tdc in reference to balancer, and all is well there. So maybe just need to recurve distributor.