Braam,
30C isn't too bad to run in, but I would still allow the engine to cool every couple of tanks. In a hot climate like you live in the best time to run is early morning, or dusk, or night if lights are available. In Texas we race at noon late fall through spring, but only race at night with lights in the summer. You should seriously consider a temp gauge to monitor your engine and you might want to consider a head with a larger cooling area, such as DuraTrax stage 2, or Golden Horizons. I intend to get one before summer.