So I took the gun apart yesterday and made a few changes:
-swapped back to original spring
-stock vfc piston head
-shaved a little off the front of tappet plate
-modded 5KU tapered cylinder head with orings. Thats right, i got a 3 ring cylinder head :P
crazy compression out of the cylinder now and sounds nice
It shoots just as far now, maybe just lacks the power at longer range. I might leave it this way until I game it once and see how I like it.