Anybody ever run too cool?

If the thermostat is working properly a high flow water pump or larger radiator should not make a difference unless it NEEDS MORE cooling. I would guess that your thermostat is opening either too early or too much at its RATED temperature. I will agree with the above suggestions to try a warmer thermostat first. After that possibly your sending unit or gauge is incorrect. An infrared thermometer can be used at the upper portion of the radiator or the hose just above the the thermostat to double check the temperature. Doing that has shown me that mine is very accurate.
Yote