maybe the speed in which the piston is being pulled back is upsetting the piston o-ring somehow making it take longer to seat when it comes back forward. When you do a compression test on the piston/cylinder assembly is it leaking at all? does it seal immediately or only seal when the piston comes forward at a specific speed?
That's really the only thing I can think of that would be happening.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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