Dave: If your hydraulic levers are out of adjustment, this can cause heat build up in the hydraulic oil. If bad enough it can burn up the pump. You hydraulic levers each should meter with it's respective rockshaft. If for example the rockshaft reaches to end of it's stroke before the lever does, and you can judge this by moving the lever very slowly through it's entire stroke. If this happens you will notice the hydraulic system is still on demand thus making the engine labor. If this happens at one end of the range for lever and rockshaft, very likely it is just the opposite at the other end of range. You have to adjust the lever to correct this.
The hydraulic problem definitely will rob power at low idle, and you will notice hydraulic demand even at full throttle, but I don't think the hydraulics would ever stop it from achiving full throttle.
From your description and the items you have tried, my next approach would be the governor. Don't let this get you down, most of us have been through this at one time or another. Inside the governor is a spring and a thrust bearing, usually one or the other or both can cause a tractor to idle fine but not accelerate.
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