Thinking some more about the choke issue. None of this is related to the binding question.
Having to run with the choke half in means one of two things, the motor is drawing too much air or not enough fuel.
Is that inline filter something recent? If so, I'd get rid of it. The screen in the sediment bowl and the next screen in the inlet elbow on the carb should be sufficient for filtering. Make sure they're both clean.
Where you've had the carb off for work, check the gasket at the top of the carb where it joins the manifold. If it's at all loose, it could be sucking extra air at that point, sapping vacuum. The other place to lose vacuum and pick up air is at the joints between the manifold and the head.
To test for that, when you get the tractor turning and running, lean out your choke to keep it running and spray something combustible near the carb and head joints on the manifold. If it picks up and runs better, you've located the air leak.
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