If you have a "draw on voltage somewhere" you can quickly and easily measure it with a voltmeter. Your battery should show significantly lower voltage when it's connected to the tractor than when it isn't.
Frankly, I don't think that's your problem. A heavy dead short is the only draw on the tractor that could be significant enough to cause slow cranking. If you had a heavy dead short, you'd know it because the battery would get hot very quickly, and/or you could see wires smoking.
I know you THINK your connections are good, but I still think there's work to do there. Are all the cables new? What gauge? Are they old cables with temporary/repair ends?
Connections include the battery end to the cable, not just the battery post.
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