I your heat mat regulated with a thermostat? Is your Che on a dimmer? I didn't see an answer when asked before. If they are not that's why you are getting a fluctuation. Unplug your heat mat until it is regulated. You can seriously burn your snake it has happened multiple times in the past month alone.

Temps are correct. Raise humidity to 70 at the first sign of shed and keep it until shed.

And congrats on on your little beep!