2 on the same side should be fine...

 

This is the point I've been trying to make. With a "closed" PCV system and fairly small diameter tubing, when the intake goes from vacuum to pressure and the PCV valve closes, the small line on passenger side valve cover going to the T/B or inlet side of turbo/blower becomes overwhelmed and cannot handle the excessive pressure the crankcase is seeing, so it starts to push in other places in the motor. How much is dependent on a lot of variables and there might even be a problem with excessive amounts, but non the less, even if temporary, provisions should be made to vent the crankcase pressure differently.

 

The 1/2 line off the passenger valve cover and air/oil seperater is large enough as long as it is run to the intake of the blower. If it is just vented to atmosphere then yes I know from experience it WILL cause seeping at the seals. The motor needs vacuum on the crankcase while in boost. I recently tried switching to a vented to atmosphere setup and I got leaks from the front seal and rear oil pan. Switched back to my old setup and no more leaks.

 

Depending on well that air/water separator flows, it could be a restriction in that line. I'd add a second anyway.