I am assuming you do not have the digital temperature controller. The fix, get a digital temperature controller. I have the TG 300, I didn't like the smoke output or temperature guessing I had to do for the darn thing. I broke down and got the digital and I have been very happy. No it was not cheap, but now the thing is a BBQ machine.
The digital controller actually regulates the fan. It will shut off and then burst on quickly. This causes the pellets to smolder more and gives a much better smokiness. Also it keeps the temps nice and even. Sorry, probably not the $200 answer you wanted.
22.5" 1999 Weber Mastertouch Redhead, New Braunfels El Dorado, GMG "Daniel Boone"