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Barrel wobble....you need spacers between the out flange of the barrel and the retaining nut to take up the space. A mix of metal shims and a hard rubber o-ring will take out the play and allow for some relief from the shock/impact/vibration. The stock WE's come with on O-ring there...it's there for a reason.
Jamming...several of the last RATech NPAS nozzle bodies that I've mic'd have been slightly oversized. The stock ones are a tight enough fit...the RATech ones are a jam fit. This causes things to hang up. Swap back to stock nozzle...or take 400/600 wet dry paper and reduce the diameter of the tip of the nozzle to be a good fit with your chamber. Takes 3-4 tries (test fit as often as you need) and about 5-10min of sanding. Apply even finger pressure to both sides of the nozzle "pinched" between the emery paper while you turn the nozzle back and forth....stop and turn 30deg every couple of turns to get an even reduction in diameter...you can use finer paper (i.e. 1200+) or whatever to buff its finish smooth. The key with this method is to get a feel for how nice a fit is good but not too tight.
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