Yep,even if the pcv valve were clogged, wouldnt the breather show signs of oil moving up in it. Also if it is not clogged, why would the oil only leak under pressure and not at any other time? Does that gasket have to sit exaclty or is it supposed to stretch a bit? Is it possible the timing chain cover could be slightly bent and cause such a leak?
the timing cover can be a suspect...they're stamped and usually suck.some brands are better then others.bm