Anybody ever run too cool?

A hotter thermostat will not change jack dammit. The thermostat's job is simply to allow the engine to heat up quickly by being closed. Then open once the coolant reaches the thermostat's opening temperature. Period.

Most older non computerized vehicles used a 195* thermostat. This has zero to do with how hot the engine runs. It only aids in quick warm up.

If you have a high flow thermostat, you might try a standard one. That could have some effect on it.