Consentrate on number 5 cylinder only, Its got to be the piston ring, sucking the oil from intake gastket, or the valve seals.
Do the compression check on that cylinder, get a different compression tester, open the TB and turn the key and let it crank 3 times then check the pressure.
last resorts, pull the cylinder head off and you will find the problem.
compression check, those numbers were way too high that you said. I hope its not the piston ring, if you havent changed the oil, you can check the oil pan for metal
Good luck, let me know what happens.
PS: I used RTV gasket maker on my lower intake felpro gaskets together on both sides. Ive had a car that sucked oil from runners, i didnt want it to happen again lol, but i doubt thats your problem now.