Too much air pressure on valve cover breathers

At WOT there is little to no manifold vacuum, so the PCV is not pulling any blowby. The connector pipe will be dumping the blow-by into the air cleaner housing. If its oil-laden, it can/will ruin a paper filter.
The cure is to go to the source. Find out whats causing it, and fix it. Different types of rings need different cylinder wall finishes, and/or different break-in procedures, and/or break-in times.