You might consider the 200 degree thermostatic plate from Mocal. I have one, though I haven't installed it yet. The 180 degree thermostat begins opening around 170 F and the 200 degree thermostat begins opening around 190 F according to the guys at BAT Inc. (Mocal distributers).
Part number: MOC-SP1FT-HT
Link to racepartswholesale.com
Or call BAT Inc. and place your order over the phone to save a few bucks