kustomwerker, this is why there is no reason to use ported vacuum. Timing advance drops off when vacuum dumps from mid-heavy throttle in both setups. So you might as well have your engine idle smooth, run at a higher timing advance under light throttle, and idle at a higher timing advance to reduce engine temperature and gas usage. There is no advantage to using ported vacuum.
Full Vacuum Advantage : Reduced Engine Temperatures, Smoother idle, increased mileage from idle advance
Ported Advantages : None