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I have a problem with my S600. After I adjust the orifice (lever height) and the pneumatic balance chamber (spring tension), the regulator breaths fantastic. However only after a dive or two it starts breathing really hard. I have traced the problem to the balance chamber. It looks like it is made to be adjusted fairly easily and when you turn the external adjustment knob, it also tends to tighten the balance chamber screw which it's not supposed to do. Now, I have the A-version of S600, which requires the external balance chamber adjustment tool, which I use. I suspect that the problem has been resolved with the B-version. The question is - is there anything I can do to fix the issue without upgrading the reg to B-version?