Engine won't cool off!!

I once had a heating problem where my car would run anywheres from 200 up to 225. So what I ended up doing was moving my fan further back from the radiator so I could get more air flow over more area of the rad, added a fan shroud along with a flex fan and a 180 degree thermostat. No more problems. Temp will run anywheres from 165 to 190 depending on the outside temp and on a hot day in traffic it may creep up to 195 - 200 but once moving it drops rather rapidly...