I wouldn't recommend running without a thermostat. If anything find a lower temp thermostat. Running without a thermostat can actually cause your engine temp to fluctuate, this is bad.
You might also want to check and see if there's any correlation to engine bay temp. It's possible that the heat of the engine bay is saoking some of the electronics, or that (if you've got an aftermarket air filter) your car doesn't like sucking warmer air into the intake.