I have a motor that I intentionally over oil through the pushrods, and use almost unrestricted spray bars as well. I did it t see how much better the spring life would be. Even with 2 pickup points on the covers it would flood the vacuum system with oil. I went to my default breather attachments, Z baffle burn down breathers that you see mostly on blown alky stuff. They're ugly, and stick way up, but even on that oil derrick all I get is water smoke.

These things are a cure all for oil geyser vacuum systems.

https://www.goodvibrationsmotorsports.com/Burndown-Breathers-Aluminum-Female-AN16.aspx