To be on the safe side, what Brain suggest i would bump temps up to 94 (92 is a normal temp) and as for humidity UNLESS you have a air temp of 82+ I wouldn't suggest bumping this up. As Cooler 76-78 and lower can only make it worse with high humidity... But with a crackle that doesnt sound too much like stuck shed, it sounds more like a small R.I (stuck shed is more of a whistle you hear every couple breaths or when they kinda huff)

There is also this to compensate the early stages to help kick the R.I out (if you cant afford vet visit or catch it early enough)

https://www.youtube.com/watch?v=NCIBI9NRD5M

Iv never had to do it, but my friend and also a snake breeder showed this and its worked for them (when caught early enough)