PV doesn't (or shouldn't) have any effect at idle. Most important thing to do is to pull the carb off and flip it over and see where the throttle blades are in relation to the transition slots. If the blades are open too far then you need to get them adjusted correctly. If it won't idle with the blades in the correct location then you need to add initial advance and/or drill the throttle blades for idle air bypass.

PV should be set to bring the extra fuel in as the engine gets under load. Best way to set it is to hook up a vacuum gauge and watch it as you drive around. Rolling into the throttle on a long uphill stretch of road should show you when the PV needs to open up. (A wide band really helps.)