Yeah, we're gonna need more info to help you properly.

A few pics of your setup and a list of the following would help:
a) what equipment are you heating the enclosure with?
b) how are you regulating the heat sources?
c) how are you measuring temps?
d) how are you measuring humidity?
Hopefully some pics provided with the above info will help us help you to help your snake.

It already sounds like your temps are low and your humidity is high, but tough to really say til we get more info.
Also, those "breathing sounds" you are hearing sound like a possible respiratory infection.