Cooling issues

I like the idea of coming on with the key and other at a set temp, i have them set at two different temps, one temp for thermostat and the other is at 200 i believe... but when i hammer mine it creeps a little, 210-215 range, wondering if your option is a a better idea......
I had them both at a set temp at first but the temp would creep up to 210-220. Even on the highway! Would stay cool in traffic though. It's all good now.