Rear seal leaki ng after a good attempt to fix? It isn't like you don't know what you're looking at, i bet the seal isn't where it is leaking from. How can it leak from the seal when it is (presumabably) sitting level in your garage - you don't have enough oil in the pan to leak out of the rear seal - if the car is on a steep incline i can see a reason to leak. The only way it'll leak out of the rear seal while sitting level and the engine not running is to have the oil in the pan up as high as the seal - but then the engine would barely crank over since the crank would have to wade thru oil.
Can you mock it up on the stand for a looksee? If it is still together can you add air pressure in place of the pcv valve and see where the oil pops up? Not much pressure or you'll be replacing the front main seal too. Just a thought, good luck oj