UPDATE!
So this is what I ended up doing.
First of all I dusted and cleaned all levels
Then I drilled a hole in the back at the middle level on the left side (side the heat tape runs up on)
I then routed the probe through the new hole and stuck it between the heat tape and the wall. It sits very snugly and has great contact with the heat tape. I taped the cable of the probe against the wall, just to make sure it won't get pulled out accidentally. I also taped the side of the heat tape to the wall to create a tighter fit, although that wasn't strictly necessary. That probe is going nowhere and I didn't need to use glue or tape or anything on the probe itself
I also decided to use my new thermostat on the Rack. I had a "Helix" on it and it didn't give me trouble, but since I bought the Herpstat 2, I decided to use that one instead. I've heard the "dimming" setting is better for Racks anyway. I planned on using the Herpstat on a free standing tub and on my incubator, But I can use the Helix on the Incubator or get another Herpstat. Who knows, maybe the follicles (if there were any) got cooked and I won't need the incubator this year.
But as long as my snakes are fine, I'm happy.
Here are a couple of pictures that show the new setup. The last picture shows that there is plenty of clearance between the side of the tub and the probe placement. No chance of the tub sliding in and out causing issues.
I want to thank everybody once again. For your well wishes for my snakes, and for your thoughts and tips. It is what ultimately led me to figure out what to do. You all are the BEST!!![]()