How are you measuring your temps? I suggest getting a good digital thermometer. Temps are not something you should be guesing at.

I would get rid of the lights as a heat source. Ball Pythons are vry shy snakes and light can stress them out, espcially if it is left on all day and night. I use human heating pads for all of my snakes as a heat source. You can find them at Wal-Mart for $10. Just don't get the ones with auto-shut off.

I also think glass tanks are horrible enclosures for abll pythons. They do not hold proper humidity and are too visible. Balls are seclusive and being "out in the open" or too visible can stress them out.