When they are all jammed in the one hide together they are not cuddling or hugging, they are competing for the best spot in the enclosure, which is under the one hide you have. Ball pythons don't like to be out and about, in the wild they spend most of their time under ground in termite mounds.
As was pointed out, if money is the problem you can set up a three-tub rack for a lower cost than getting two more tanks + the accessories required for them.
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