For a bunch of fine tuners we all claim to be. I really don't understand what the harm is running an engine hotter.

If a car goes faster running the ignition timing at 35, why run it down at 20, 25 or 30.
If a car likes a 14.7 fuel air mix, why run it at 16 or 18.

So your car overheats at 250. I see no need to run it down at 160 or 180. Get it up to 195 where it's documented to run the best.

What kind of problems are we experiencing running the factory recommended thermostat?