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I'm not comfortable with running a thermostat hotter than stock. I would start by going back to the factory temperature t-stat, which should have a huge impact on the amount of time your fans spend on. Yes, hotter oil is thinner, but you can get the same effect at lower temps by mixing a little 0W20 with your 0W30.
You should also inspect your radiator. I've seen some pretty bald radiators while combing the junkyard. After a decade or so, the fins start to come off, and they lose much of their cooling capacity.
p.s. your battery is going to die soon, and there's little you can do to save it. Most batteries last 5-7 years depending on climate and service conditions. You should be able to buy a gently used battery at the auto parts store for ~$35. Call around when the time comes.
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