Blaker,
Don't worry about the cabinet at all, only concern yourself with the liquid beer temp and adjust the temp to where you want it. To get an accurate liquid beer temp you need to use the "Chug" method. To do this pour a beer into a clean, dry, non-chilled, beer mug and chug it, then pour a second beer in the same glass and take the liquid temp of the second beer. Doing this eleminates the temp differences between the line and the keg. Once you know your beer temp adjust the themostat a bit and check again in a few hours then repeat the process. It may take a while to get it where you want it but you'll have fun getting there.
Semper Fi,
The Gunns
"Beer is proof that god loves us and wants us to be happy" - Benjamin Franklin
Im a
MicroMatic Beer Fanatic! Are you?