I would say that the hides are probably not the problem, since the OP stated that they are the sames hide he had before moving the snake. I'm not sure about the size of the tub...I don't really know my metric system very well. Depending on the size of the snake, a 32qt tub is about as big as you would ever need for a male and most females, but some larger females could benefit from a 41 qt tub. And I just looked on the side of one of my tubs, and it looks like a 32qt is equal to about 30 liters.

I would probably just let him settle for a week or two, and I am sure he will eventually get used to it.

And about the holes...20 is plenty. Really I would say 5 would be enough. The holes are mainly for adjusting humidity levels more so than for air. I probably have about 60 holes in mine on all 4 sides combined, but it gets very humid where I live during the summer. During the winter it is less humid, and I mist my tubs daily when my snakes are in shed.

As far as the ambient only being 70 -- I would not worry about it. My ambient in my tubs very rarely gets above 70 in the winter being that we keep our house at 68. I keep my hot side at 90. I have had my snakes in a rack with these temps for a year now, with no RI's or any other problems, and am even getting successful locks between two of them right now.

I hope all this helps!!