I'm no Vet. But, I have used orally administered Baytril at room temp. in the past on rodents. We would replace it after 2-3 days when it turns cloudy. I asked my gf who has more of a pharma background--she said in your case not to use it.
Given the size of your ball python I would not be concerned about feeding it. Digestion puts a great deal of strain on snakes and you need the energy to fight the infection. You should also completely stop all handling until your snake fully recovers--regardless whether or not your ball python enjoys it: it is a form of stress.
I noticed that you said your ambient is 80, but, your surface temp on your cold side is 75-79. If your ambient is truly 80: then all surface temps should read at least 80 unless the heat is not reaching that part of the cage. I would recheck your temps. Especially with an RI--you don't want any surface temp reading below 80F. Your 'hot spot' (generated by the UTH) should not be above 90, and your air temperature should not exceed 85F in any area. Sometimes this requires two thermostats (one on each heat source).
Do make sure you have a water bowl large enough to let the entire snake submerge completely. When I lived in the city I would dechlorinate my water. Also since your humidity is a bit on the low end I would take a warm damp (not wet) towel and drape it across the top of your ball python enclosure periodically to increase the humidity to help it breathe.
A respiratory infection in a ball python can be tough to defeat. You may have high anxiety, but, do keep in mind that if you have a viral infection that there is nothing you can do aside from provide a comfortable environment. The snake may die even with the best effort and skilled keeper-so do what you can to learn and don't beat yourself up about it.![]()