I wouldn't worry yet. It may just be finding it's own natural level.
Coolant will expand when it's heated (think of the overflow tank for the coolant in your car or truck). If you filled your motor cold up into the neck to just below the overflow, it would expand from there when you warmed it up, with no place to go except out the overflow. Go ahead and let it cool. It should settle down to about an inch below the bottom of the neck. If so, Id say you are fine. As long as you had it good and warm, it shouldn't overflow going forward other than a very little if you ever get it runninhg hotter than you have already.
That said, it did start overflowing fairly quickly given how slow these motors are to warm up and that makes me wonder if you have a sizable air pocket going in there somewhere. Air expands much more with heat than coolant will. Was/is the tractor on level ground when you filled it and were running it?
Uphill isn't really a problem as any bubble will make its way to the outlet at the front of the motor. If the tractor were pointed downhill, you could have a pretty significant bubble/air pocket at the rear of the head that could be heating quickly enough to force your coolant out.
You might try running the front of the tractor up onto a a couple of 2x planks which should raise it enough to move any bubble forward and out and see what that does to your coolant level. If you've been on level ground right along, I go back to the first point and suggest that it's just findin its natural level.
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