Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

I’d recommend using the vacuum advance for what it’s good for, economy. Disconnect it for now, get the curve sorted out for driving, and power, then add the vacuum advance in later on ported vacuum and tune it for mileage. Your numbers do seem erratic for the vacuum advance so there might be some work that needs to be done to the actual unit itself when you get to that point.