To me it seems like there are couple of issues.

If your BP does not have any mites, my guess from the pics you posted would be that he is using his water bowl instead of his hides because they do not provide enough security.

Log hides make poor hides and your clay pot is not ideal either.

Ideal hides need to be tight so your BP can snug in, with all sides touching you BP's body. Also need to be identical so your BP does not chose security over thermo-regulation.

Here is my favorite type of hide but you can also make some yourself out of plastic bowls.

This is how an ideal hide should fit your BP, it was posted recently by Ed (Freakie_frog) http://www.ball-pythons.net/forums/s...3&page=1&pp=10

One more thing
the cool side of the tank that stays between 80 and 73
Temps on the cool side should be 80-84 and in no case fall under 75 as it will increase the risk of RI