More than likely, it's the .0005 tolarance that the control valve spools are machined to. No 3pt systen that I know of are equiped with a dual pilot check valve installed. You can still have microscopic seepage past new o-ring and poly pack cylinder sealing components. What rate of seep down do you consider exessive?
My 730 Case arms will drift down in week with a 500# load on them, some will drift down while you are having lunch. Cut a 4x4 to length to block up the 3pt if it becomes a problem. I'm sure the remote cylinder you have will drift down for the same reasons.
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