Oven heat erratic

Question

The oven heat will not regulate. At 450 degrees cooking thermometer is around 200 degrees. At 550 degrees the cooking thermometer reads over 600 degrees. I have replaced the temp sensor (thermocouple), no help. Inspected the control panel, can't see any obvious defects. At this point I am guessing it is a problem with the control panel. Are there any adjustments or other parts that could be the problem?
Sears Kenmore 911.4742590