[Cracker]

Clois,

I'm going to jump in here with a question on the same topic.
Unlike you I am running a PCV valve off the rear of the intake and breathers on each valve cover. When pushed hard I've noticed the same problem as you and yes I do have the aluminum splash guards in the covers. Other than a little mess it doesn't seem to be a big problem. It is an FE as well by the way. Anyone with an answer to Clois question is of interest here as well!