[DanEC]

Kevin - you could run a leak down test on the motor and see if it is loosing cylinder pressure past the rings into the crankcase. It probably wouldn't be a fun experience getting the fitting into some of the plug locations.

I wonder if it would be useful to hook a fuel pressure gage up to the PVC hose and block off the other breather and see what type of pressure you have in the crankcase: confused: I guess an option is to install a vacuum pump system.