You might also check the location of your sensor. I detailed my story (POS Avanti, still first beer foam) about having the sensor (in liquid) located to close to the cooling plate. After moving it away from the cooling source, I get a more constant internal temperature and my poured beer temp is right at what the control says.
After only a few days of setting my control at 38 I was drawing beer at close to 45 degrees when I realized what was wrong. Couldn't imagine sensor location making that much of a difference but it did.
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...P.O.S. Avanti BD6000 stolen from Best Buy...
...external digital temp controller...
...circulation fan...
...tower fan...
...3" double tap tower...
...MM Premium Regulator, couplers, beer lines, taps, fittings
...a lot of sweat  and beer  ...
"I will not tiptoe thru life to arrive safely at death"
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