Hey bubba, 230 is not hot really.. but the first thing I would start looking for is an air leak. Check the exhaust gasket to see if it is torn or just not seated properly.. Then be sure the carb is seated well, square and tight..Check the head be sure it is tight.. And yes you should be using a second gasket on the head, especially when running 30% nitro.. 20% needs two gaskets and 30% needs 3 if your temps are 230 thats not bad but I'm sure your fuel consumption is high!!