Interesting problem and I have no direct experience to bring to bear, but couldn't resist a comment. Even though it has two separate systems, the situation you describe shows that they are not truely independant. The weak response after the system gets good and hot suggests that a valve is sticking open or leaking somewhere in the system. Since it returns to full power when the swing system is being activated, it must be impacting the other system by either applying a back pressure to reduce pressure or increasing pressue in some manner that makes the faulty valve work. I'd look for a place to insert two pressure gauges into the two circuits and watch the behavior as it warms up. I'd pay particular attention to the pressure relief valves, and see if there is one that could be leaking, but could be affected by back pressure from the other circuit. Perhaps both circuits share a common return to the sump from the relief valves. A detailed hydraulic schematic would sure help. good luck and report back what you find.
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