I'm having similar problems so I'l post in hear as opposed to starting a new topic.. I just hope this still get's seen despite that.
Would really be better if you were starting your own thread it would get more attention, I will answer here anyway.

I use a heat lamp that also provides the UV rays they need.
They don't need UV, so I am not sure why you provide UV and who recommended that but, I would bet it was a pet store!

Keep in mind you need to provide belly heat with a UTH.

Anyway know that, as long as your BP does not loose too much weight he will be fine, second try to proceed by elimination to find out if there is anything that can be done so your BP resume feeding.

Check your temperature and make sure they are 80-84 on the cool side, 90-94 on the warm side, of course this mean you need to have an accurate reading provided by a digital thermometer/hygrometer.

Check your humidity and make sure it is between 50%-60%

Make sure the enclosure is in a low traffic area.

Make sure your hides are tight enough so your BP can snug in, all sides must be touching your BP's body (Avoid log hides as they do not really provide enough security for a BP).

If you handle your BP often, try to limit handling (Too much handling can cause stress)

In my experience Ball Pythons eating smaller preys will eat with more consistency (I feed my adults a small rat 4 weeks old - 45-65 grams)