Oil out of breather filter...i've tried everything

I can't seem to figure out how to keep oil from spewing out of my breather element. Here is everything I've done.
I switched to an open element filter to keep oil from going back into my intake to and keep it from burning so much oil as well as to keep my intake system clean.
I replaced the PCV valve with a brand new Motorcraft one. Still didn't fix it.
I then did a compression test and had 165-170lbs. across all four cylinders. I'm assuming with those numbers my rings and valve seals are good. I shouldn't be having excessive blow-by.
I then did a search and found out about using a Villager brake booster check valve in conjunction with the PCV to sort of double up the effectiveness of the PCV valve. I cleaned all the oil up with brake cleaner and took it for a test drive with the Villager check valve installed. I thought for sure it would fix it.
Took it for a drive, sure enough blue smoke behind me. Pull into the driveway and pop the hood. My spark plug boot was on fire from the pooled oil on the manifold.
I've gone through 8-10 quarts of oil in 3,500 miles. If anybody has any suggestions it would be greatly appreciated.
Mods are 3" single exhaust, Walbro 255 fuel pump, Gillis MBC set at 15psi.

I'm trying to visualize the "oil pooled on the manifold" and "plug boot on fire". Is the oil return line from the turbo to the block kinked or blocked? Pooled oil (especially after a short ride) is indicative of an oil pressure leak or loose fitting in the supply line to the turbo or the return line blocked. Very rarely do the seals leak on the turbine or compressor sides of the CHRA, but it is possible.

Just my thoughts

I'm not sure what CHRA stands for. I'm assuming it's a type of turbo. I have a Garrett turbo from an SVO Mustang in place of the factory IHI. I did look all over for a leak in the line that goes from the top of the turbo to around the backside of the engine. I didn't see any kinks or leaks. It was hard to trace it around to the driver side of the engine though. I'm assuming that is the supply line. I didn't look for the return line. That's the one that goes to the oil pan, correct?

I am like 95% positive it is coming out of the breather. All the oil is on the top of the valve cover around the breather and it just runs down the sides of the head on both sides. That's why it just pools up on the exhaust manifold. I've also checked for leaks while the engine is running and I don't see any leaking out anywhere.

I bought a catch can setup but that doesn't help the fact I go through so much oil between changes.

Would it hurt anything to unhook the PCV line and plug the nipple on the intake manifold to eliminate the possibility of boost pressure entering the crankcase? Thanks for the help

Have you checked to make sure the breather baffle is in place inside the valve cover?

Will I be able to see it if I just pop off the breather filter?

The breather baffle is in place. I don't know what else to check. I'm going to buy some dye to put in the oil to double check where it is coming from.

The only reasons I can think of oil coming out of breather are bad PCV valve letting boost pressure in the crankcase and worn rings allowing excess blow-by. Neither of which are the problem. Any ideas?

If you put a bigger breather in the head and at the block vent, it should eliminate the problem. The guys with the sand rails do this by going with a 3/4" hose out the crank vent and also at the VC. Both hoses run to a big oil catch can that has a breather at the top. No more PCV valve, or headaches from what I've been told.

Well for a test you can vent the crankcase like was mentioned. Vent it with a hose to a remote location and then vent the valve cover with a hose to a separate remote location. Then see if the oil leak moved to one of the new locations. If not obviously it's an oil leak that only shows up under high rpm/oil pressure (I had a coolant leak like this that took a while to find since it didn't leak at idle only high rpm), or if it's a vent leak and only shows up under high boost/pressure. If the issue goes away maybe venting the crackcase solved it somewhat and get a catch can. When in boost the PCV valve closes the crankcase vent and it should then vent up through the valve cover breather. Honestly I'm shocked you are having this issue with only 15psi, but who knows? Hope ya find it.