The air intake filter has nothing to do with the PCV system. The same amount of air is in the crankcase regardless what size filter you have as it is metered.
If you add breathers to the valve covers, this will give the crankcase a way to relieve the pressure. But then when it's running N/A you create a vacuum leak... The upper intake will suck air from the crankcase via the PCV valve. As the air gets sucked from the crankcase, it needs to be replaced. It will take that air from the breather caps, suck it into the crankcase, through the PCV, and into the upper intake... Thus introducing unmetered air into the engine...and that is bad.
A solution... remove the PCV system and convert it to a Breather type setup. To do this, remove the tube that connects the oil filler tube to the TB and cap it off on the TB side. Take the oil filler tube side and vent it to the atmosphere (or replace the entire valve cover and just pop on a breather instead.) Take the tube that connects the PCV to the upper intake and disconnect it from the upper intake. Plug the nipple on the upper intake side and let the tube (which is still connected to the PCV valve) vent into the atmosphere as well. Now add a breather to the opposite valve cover. A lot of times, people will place this tube right next to the filter on the inlet side of the supercharger. That helps reduce the smell of fumes in the engine bay and passenger compartment.
There is another method that some people seem to use successfully. It involves leaving the PCV system connected but actually running an open breather. Like I said above, that creates a vacuum leak. But some argue that it is a very small vacuum leak and you can tune around it by slightly enrichening the mxture to compensate for the vacuum leak.
To do this, you need to make a few changes. First, get a nice fresh PCV valve. Look for one off an old 4 cylinder turbo Mustang because that one is designed for boost. If you can't find that, then you can get one for a 1995 Toyota Supra which was also boosted. Just be sure to get the grommet for it too. You will also need a check valve. The cheapest way is to just get a brake booster valve.
Once you have those parts, install the new PCV in place of the old one. Then, take the check valve / brake booster check valve and place it in the middle of the vacuum line that goes from the PCV valve to teh upper intake. When in place, it should allow air to flow from the crankcase. But when pressure is applied from the other side it will prevent any air at all from getting by and into the crankcase. Now get a single open-element breather and drop it on the passenger side valve cover. By doing this, you let the PCV still suck gasses out of the crankcase during normal operation. And when you hit WOT, the check valve and new PCV slam shut to protect the crankcase while any blowby will easily be blown out the breather cap.
Looking at a standard PCV diagram usually helps to see what it is designed to do.
Update for me: I have went to baffled valve covers with AN fitting, moroso vented/baffled catch cans, and a T-Bird SuperCoupe PCV valve (no other check valve needed then). TB is plugged.