I run two breathers. That along with a baffled vacuum line from the front of a valvecover. I run pushrod oiling AND spraybar oiling which puts a lot of oil mist in the motor. If you have enough pump capcity to need a vacuum regulater then you are running more air through the motor and carring mist to the pump with it. Reducing pump speed till you need little or no regulater will reduce oil coming out of the pump. I don't need a regulater to get 10 inchs of vacuum, as much as i want. Not using a regulater also makes it easier to spot problems. If the vacuum is less during a run, time to look for trouble. My last outing vacuum dropped. The pan bolts were loose. No more cork gaskets for me! I had checked them twice and the gaskets still compressed more.