I thought it might be useful to post the resolution to my original problem ...
It appears that the lack of cooling power was due to the frost build-up on the cooling plates. I guess I didn't realize how much there was until I analyzed it more closely. I turned the setting up enough so the frost would melt and drip onto a couple of towels I set up towards the back of the unit, dried everything up, and turned the thermostat back down.
Sure enough .. I can maintain about 38 degrees with the thermostat set to about the 2:00 position. It's been working fine for the past couple of weeks.
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