CHE's are dangerous when used with plastic tubs, I hope you have no cats, dogs, or children

A 28 qt tub will hold good humidity without spraying, I bet your hygrometer is not reading the humidity well.
95 degree hot spot is a touch high but do-able, I try for 92ish but 95 won't hurt.

The least you want to use is a thermostat like this...http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S