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Agree with Mr. Buzzard. You might want to remove the stock thermometer and do a boiling water test to see what it reads when the water is boiling. Should be 212* degrees. You should plan to invest in a separate digital wireless thermometer such as a Maverick ET 732 or something similar. If you resolve the thermometer issue, you can then look into installing a needle valve to help cut the temp down. Do a search under "needle valve". There are lots of threads.
Thanks for the replies. I never trust the original thermometers. I have two digitals I use on my stick burner. I'll look into the needle valve. Thanks.