valve leaking?!

[junits15]

So my gun ('09 pilot) has a slow leak from the valve. The problem seems to be the cupseal, I swapped it out for the 2nd one I have but that one leaks too. I tried unscrewing the valve pin a bit from the cupseal and it stopped the leak for a while but it came back. I think the hammer hitting it screwed it back in but that's a stretch. Its very strange it comes and goes randomly, the only other thing I think it might be is the valve spring. Can they become over-compressed after a while and not push hard enough on the valve?

ALSO i removed and carefully inspected the valve body but it seemed perfect and had no dings or scratches in it.