Do you think snakes have a preference?

I've had a pretty crazy day...

I am finding it impossible to keep the humidity up in my 20 gal tank (even with the humidifier I made yesterday.) So today I went a little crazy...

I went online and bought a 11" strip of flexwatt and a herpstat thermostat, and then went out and bought a 24x16x7 Rubbermaid container.

I just wanted to see if I could get the humidity up as well as the temps in the plastic cage. As of right now I am using a POS name brand UTH that as far as I'm concerned does absolutly nothing. I also stuck the outlet of my humidifier into the plastic cage. At this moment warm side temps are too low (86.5) but my humdity is at 61% which is an acheivement for me.

I think my main problem with the 20 gal tank is that I have to heat with a ceramic bulb as well as the POS UTH which is sucking out all my humidity.

So i'm wondering wth I should do when my flexwatt and thermostat show up? and what to do in the while I wait? I just want what's best for my baby. I won't be moving her from the 20 gal tank for at least a couple days b/c she is due to eat tomorrow and I don't want to stress her out.

So far this is what I know about glass and plastic.

Glass
Pro - being able to display. looks attractive in a room.
Con - Hard to control temps. doesn't like to hold humidity.

Plastic
Pretty much the opposite of glass.

Do you think the snakes know what's going on? any stories of snakes preffering one over the other? I know I would rather show her off in the 20 gal. but not at the expense of her well-being.