The heat difference between the top and bottom shelves are normal. The tops are always going to be hotter.
So adjust your rack temp accordingly so that all shelves are within an appropriate range. (Always under 95)
Maybe 88 for the bottom so the top can be a nice 92 (since you mentioned a 4 degree difference)
Also, you don't want to use aluminum tape to tape down the probe. It will trap heat and give you inaccurate readings. Tape the cord closest to the probe down(to avoid trapping heat on the probe). And you want it in the middle shelf in the middle of your flexwatt of your rack. I just use scotch tape to tape my probes down.
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