Put tubes in the tires and fill them with washer fluid. Part of your problem is the aluminum rear...it's about 55 lbs lighter than the cast iron rear. I have about 300 lbs on my 782 with aluminum rear and 2-link chains. You have 4-link chains. 2-link chains would help, but I'm not sure they'd make a big difference. I've found it's just about equally easy to spin tires with either type of chain on them, given the same amount of weight.
If I were you I'd start looking for a snowblower attachment. Then it doesn't matter how much snow you get because you won't be pushing it.
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