Hey there,

You will know when he is going to shed, because his eyes will turn "frosty" or "blue", and his skin may look flaky. He will also stay hiding for about a week or so, don't disturb him during this time. They can get pretty PO'ed, since their eyes are frosted over, they can't see very well, so they may get defensive. Also, when you see his eyes turn blue, bump the humidity up to about 70% or alittle more until the day he sheds. I do this for my ball pythons, and I have yet to have an incomplete, perfect shed.

As for the water bowl, it only needs to be big enough for him to fit in all the way in case he wants to soak. (And you'd be suprised what they can fit in!)

Now, as for him being on the cool side all the time, he knows what temperature he wants to be, and he knows he has the option of being warm. I wouldn't worry about it unless you start seeing him wheez (since being too cold MAY lead to an RI). Other than that, I really wouldn't worry. Your temps sound fine. I was almost going to suggest raising the cool side temps a couple degrees; but he seems to enjoy it that cool.

Hope that helped some.
Jennifer