Ball python heating help

[Malum Argenteum]

During the day he is always on the back left in his hide on the cool side. once the lights go off i see him go to the warm side right under the DHP for a little then crawls around his hide

That could imply (a) that the overall temps are affected by the visible lighting, or (b) that the snake is avoiding the UVB (which is on the DHP side, yes?). Unless you have a good baseline on how the snake behaves without the UVB, it might be good to see how he behaves with it off for a few weeks (it would be good to use a meter to figure out where the irradiation zone is; this helps with figuring out how the snake is behaving in relation to it). Be careful not to adjust more than one thing at a time, otherwise you can't tell which variable is the cause.