In all my troubleshooting I noticed the same thing you did. Cold temps at the bottom, warm at the top.
I went at that problem in conjunction with the warm tower problem - used a small but powerful fan to push air in the tower, then it comes back down into the box fast enough to circulate that same cold air over the top of the keg and on down.
I only have $6 in my fan setup - would have been a bit more if I didn't already have the fan and power supply laying around. I hope to get several pics when I run this 1/2 bbl dry.
However you fix it, congrats in advance. Nothing like figuring this stuff out and enjoying good pours of cold beer.
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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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