Try swapping the 2 coils and spools around and see if your problem changes direction. Don't forget there are also 2 diodes per valve in the wiring harness.
As for the heating problem, we had overheating problems (one of the operators wearing shorts actually singed the hair off the back of his legs on the hood) on 2 new Clark CQ25s. The fix was to add Royal Purple's Purple Ice additive to the coolant. It cut the operating temps in half.
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