Today Yafe was still popping and it was not noticeably better than yesterday. However, he seems like he is feeling more comfortable. I don't have any crazy evidence to support this, but it's more of a gut feeling. When I take him out for the nebulizer treatment, he is active but calm, and making more deliberate and gentle movements. In the past, when moving, he often seemed uncomfortable and would make quicker and more dramatic movements. He would also hold me/my arm/hand really tight from time to time. Now he seems to hold me much more relaxed, more like what I am used to from my other snakes, all constrictors.
After nebulizer treatment, there was one slight wheeze, and a lot of popping, but even that seemed better today. Maybe there is less gunk to break up now?
Either way, treatment 5 of 21, so not jumping to any conclusions and still concerned. However, I am latching onto any glimmer of hope at this point. I am trying to stay optimistic.