I have two reticulated pythons, I have them in ARS tubs (both with windows on the front) in a rack and have never experienced either one of them pacing the cage or rubbing their noses. I use Reptichip substrate, spray down the substrate with water twice a week, and offer food twice a week. They are fat and happy and very content. I had my bigger one refuse her rat last time I fed, but when she wants food she comes up to the tub window and gives me the hungry eye LOL. I think it was that big extra jumbo rat I gave her, probably was full for the whole week. Once she gets up to rabbit sized food she may not eat as often, maybe every 1-2 weeks. Once I see my snakes getting on the fat / heavy side I cut back to feeding every three weeks or so.

I think the key to them not rubbing is keeping them very well fed in an enclosed space with solid walls on all sides, no lights in the enclosure, but still have a small window where they can look out since they are a very smart and curious snake. I think large tubs with small windows work the best. Seems like the traditional retic enclosure has lights on the inside and is very open and exposed with a full glass front, not sure I agree that it's best for the snake's sense of security.