You'll want a better thermostat that sets a specific temperature, rather than a rheostat (which is what it sounds like you have).
I personally wouldn't have gone with a fogger, but rather would have added a couple humid hides (damp sphagnum moss). That would have saved you a LOT of money. I had glass vives as well before switching to PVC. I switched because I liked the aesthetics, not because of the way it works. To be honest, I found it easier to maintain the glass enclosures... but that is because I have two different species sharing a vive with a divider!
I had absolutely no issues with the glass once I got my set up figured out. What kind of heat bulb do you have? I suggest either a red bulb or a straight up heat emitting bulb. You'll want to keep those on 24/7, so there are no night drops.
If the cool end drops to 65F, your home is also that cool (or cooler). Simply put, the easiest way to fix this would be to turn up the heat in your home. If that is not an option, you can either add a second heat lamp with a low wattage heat bulb - although with a UTH and high wattage bulb already, I personally wouldn't go for this as your vive is dried out enough as it is - or get a small heater for the room the snake is in.
Best of luck!
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