If you have oil coming out of the cylinder's rod port when it is all the way up (bottomed out mechanically) you have a piston seal leaking at high pressure. (unless it has a phaseing check valve in the piston)
Oil coming out of the line that would be connected to the cylinder's rod port....I suspect that the valve has anti cavitation checks. Once return gallery pressure goes up above the value of the check's spring, (and it will due to flow) the anti cav check opens since the line is open to atmosphere.
If you have a cracked valve, they tend to get worse as the unit warms up. Once warm, you can about pick the pressure you want to see by varying the engine RPMs. For this test, plug the lines going to the cylinders. Note, cycle times should be slower the bigger the internal leak.
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