Like Aaron mentioned 85 is a bit cool for the warm side. I would suggest picking up a UTH and a thermostat to provide your basking spot, use the the lamp if you need to increase your ambient temps. I would also try two identical hides if they are not already. Here are some suggested but of course not all inclusive links.

Hides:
http://www.reptilebasics.com/hide-boxes

UTH:
http://www.amazon.com/Zoo-Med-ReptiT.../dp/B0002AQCKA (Can be purchased at your local Petco/Petsmart, just double check on the size you need)
http://www.reptilebasics.com/heat-tape (flexwatt in general is a common UTH, repltile basics will assemble it for you if you request it.

Thermostats:
http://www.amazon.com/Hydrofarm-MTPR...arm+thermostat
http://spyderrobotics.com/

http://ball-pythons.net/forums/showt...t-Thermometers - this link includes information about the different types of thermostats. (on/off verse proportional)