Sounds like an air leak. Instead of throwing money at the problem try sealing the bucking tighter to the barrel with dental floss or teflon tape, I saw an increase of over 30 FPS from that one thing so it may get you back to the numbers your used to. Also if you start swapping out a whole bunch of parts now you'll be even more stumped if you develop issues from parts not being 100% compatible or slightly off spec.
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