Need Suggestion on a good Heater

I bought an aqua-medic controller and 500w heater for my 90... they both work great and Aqua-Addicts stock em....
 
So I am confused by what is happening with the temp in my tank. The Finnex digital controller reads 80 degrees but is set at 77, three different thermometers read 76.1, 77. and 79.6 all with probes in the same spot.

I decided to order the ranco unwired version from the Ranco website, get it express posted, and do surgery when it gets here. Costs me $81 with Post Office shipping. They charge $60 for the controller and after talking to them chose the 111000 model. We'll see if tis soles the problem.
 
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