Sounds normal to me. The main thing to look for on the belly is slight browning of the tips of the wide under-belly scales, which is a symptom of scale rot.

I didn't really understand your statement regarding temps. Try to avoid exposing the snake to any temps less than 80 degrees, even at night, to avoid problems. They're much stronger feeders too, I've noticed, when the ambient temps stay above 80 at all times.