How many degrees is the vacuum advance adding to the mechanic advance? To check at idle, see how many degrees are at initial without vacuum advance connected. Then connect vacuum advance to manifold vacuum (full vacuum) and recheck degrees. The difference is your vacuum advance degrees. Most vacuum advance cans have plenty of advance built into them since they are focused on economy. For the most part, you will not need it, especially since you no longer have a stock setup. If it runs strong, and power is smooth when accelerating moderately, leave it unplugged.

Focus on the mechanical advance seetings. First find the total advance the engine likes. Then determine what initial degree setting that the engine /cam runs best at idle or idle in gear if auto. Then play with mechanical advance limits and advance curve springs until you get then best acceleration. Stick a fork in it a call it done!
Ron