Wheezing boa

[Mugwump]

Recently, I noticed that my bcc seemed to be wheezing slightly. The sound was not entirely unlike the squeaking my lungs make after a night of smoking too many cigarettes (I could pave a highway with the contents of my lungs.) I don't think it's a full-blown RI since there aren't any other symptoms. He's still active, has no discoloration of the mouth, no nasal bubbling, etc. etc. RIs, as I recall, usually have to do with humidity levels, right (which were still on the moist, tropical side from all the mistings during his last shed)? So I took his humidity down to 40% and am twiddling my thumbs wondering what else would be beneficial. Would raising the heat be a good idea? He's currently at 90/80.

Another thought I had was that the mesh-top aquarium bachelor pad I have him set up in is not providing adequate air circulation, which is a criticism of aquariums I wish I had known about before I bought it. I do plan on upgrading the viv in the coming months, but if air flow is the problem, is there anything I could do in the short term to improve ventilation? Maybe put a fan on him (which would take the humidity and temp down, methinks)? Any suggestions welcome.