Update:
I have since shaved down the rails of my Piston body from help that someone posted a video of. Exact problem I was having. After shaving about 0.5mm or so off the body the piston moves freely. I also changed the nozzle to a Retro Arms 21.4mm nozzle and I am back up to ~1.3J. Thanks everyone for the input and help!
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WREAK HAVOC
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