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The shift quality difference is real with a proper WS fluid. Your temps look solid in that climate, so I wouldn't stress about overcooling—that's usually a much colder situation anyway.

Yeah Fluid Film doesn't hold up for exterior stuff like that. The thicker options should work way better though. Which one are you leaning toward?

Lighter fluid and Stoddard are different products — just search for 'Stoddard solvent' specifically if that's what you want. Mineral spirits is in the ballpark but not quite the same thing. Most hardware stores stock it and it's not expensive.

Hard to verify without proper dyno testing tbh. A lot of treatments in this space just overpromise.

Given youre already changing yearly against 400-hour specs, the Donaldson vs FleetGuard difference is honestly pretty small. Both are quality, so just pick one.