I like mkirsch's idea about the possibility over-adjusting the surge screw. I'd start there. And he's absolutely right. The governor doesn't speed your engine up when your load changes - it merely adjusts the fuel to maintain the engine speed, which makes all the sounds of speeding up when it adds gas.
On the hydraulics, they shouldn't consistently run in the hot range. Besides your valve for the remote, you should check out your two levers for the rockshafts. What will cause the over heating is continuous high pressure operation. An example would be if things are adjusted in such a way that when you pull one of the main levers to the rear the pump doesn't fall back to low pressure when the arm hits it limit. So it keeps on pumping at high pressure but it can't move anything. So you have to use your stop clips to set a higher lower limit, i.e., so you can't pull the lever all the way to the rear. And you could have the same sort of problem on the upper end of those levers or, as suggested, with your remote valve sticking.
The shop manual for the Touch Control explains pretty methodically how to set the stop clips up to avoid such a thing. Without having a gauge, it basically involves listening -- if you have both levers in the middle of their range so that the arms can move either direction from there, you should hear some whine from the TC box and pump when you move them. The noise should stop when the arms have finished moving. If you pull a lever all the way to the rear and the whine continues after it stops, move the lever ahead until it does stop, and set your stop clip so that that lever can't move behind that point.
The Operator's Manual only talks about using the clips for limiting the height or depth of an implement, but the shop manual for the T/C unit talks about using them as I described. The Operator's Manual also talks just briefly about overheating with the T/C levers on the upper end of the throw (They use the example of setting the levers to a position that would lift the implement higher than it can go, because it hits the bottom of the tractor) so that the unit can't finish cycling and stays on high pressure, same phenomenon as I describe but on the top side.
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