MikeFerrara:Once you get an Apeks flowing turning the mouthpiece down won't stop it.
Works for me on the TX50 main and TX40 octo.
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Try adjusting the lever on the side of the reg back a bit, there are + and - signs. You dont want it full + if its doing that - reduce it to 2/3 or something and re-try.
FWIW i keep my TX40 octo at full - and my TX50 main at near enough full + (slightly off).