I missed nothing.

It could also be the current setup and the lack of proper hides. You and I are not there but I see no reason to have the OP scrap their setup for a tub without truly knowing the issue. We all know the half logs look good but they are not ideal for snakes. Some added moss or other hides may fix the issues without having to switch to a tub.

Ill back out of this thread even though I have experience with cages like the OP is using and have been successfully keeping snakes outside of the "proven" methods.