low compression in 2 cyl. need advice

[ANVIL]

a little bit of background in this thread, rb25det in s13

http://zilvia.net/f/showthread.php?t=601919

Short story of what happened.
-went out for street tune, felt boggy and misfire after a few pulls at 20-22psi. during session found valve cover vent tube blew off and oil leaking from valve covers
-found oil in ic piping. Found pcv to be bad. Leakying vc allowed spark plug galley for #5 to fikl almost completely with oil. Replaced and installed catch can. Also cleaned up all oil.
-still runs rough. Did compression test 1-4 @ ~155-165. 5 @ 90 6 @65

not sure what caused this. Leaky Pcv valve do enough to do this kind of damage? Or completely unrelated?

Prior to tune session it ran great at 18psi. i have a hypergear turbo upgrade which can stil make great power up to 24-26psi on my stock block/head. Was going to crank it up until this happened. All we really got to do was do a few pulls at 18psi to log and keep afr safe before adjusting ign timing. Did a pull at 20psi. Everything ok. 22psi pull is when it occured. I doubt the tune played a part in it, all we did was log abd adjust afr on the rich side.

sounds like rings ? Just old? Can i just get new rings and replace them for 5 & 6? Can valve seals cause this bad of a compression drop?

Now i need to decide on what to do and what is the next step to diag then fix this. All opinions and advise is apprcieciated