whozilla

I have over 316K miles on my baby. Just redid the head gasket for the second time. Replaced the radiator, thermostat and flushed and purged the system. U can drive about 7 to 9 miles and then she gets warm, the temp gauge will climb up to the top of the the little thermostat on the gauge. I can rev up the motor to about 2200 rpms and it will come down to normal. It started climbing today and almost went all the way to the top while I was driving then finally cooled back down. I am very confused and frustrated. I love my baby and need her to be around for another couple of years. Any suggestions or fixes please?