Tweak
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It's got a closed mouthpiece, with a very small hole, which adds noticeable drag.
Really? Your hole must be super tiny. I notice no extra drag at all on my D-020-W and I'm extremely picky on drag.
If anything, the smaller hole MP helps me pace my hit. I can't draw too fast/hard and run out of breath like on some pieces.
I just loaded it with water to double-check. Only notice drag when I'm pulling as hard as I can.
Kinda the exact opposite thing you want on a matrix rig.
Yours has a Matrix perc? Is there a newer version?