You've got a fresh engine with tons of compression, and you're working the tractor like a government mule. That creates excessive heat, and the hot spots old is talking about.
There is no one "right" plug. You need hotter plugs if you just putter around the yard, and cooler plugs if you flog the thing.
In Champion plugs, the higher the number the hotter the plug IIRC. D21 is hottest, D15Y is coolest. Autolite is not as straightforward with their numbering so I don't want to stick my neck out on that one. People don't like Champion plugs anymore though.
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