I regularly over-stuff my 5 x 5. You have to prune them ruthlessly.
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Height has mostly been kept in check (this is the end of the second week of stretch) with super cropping/stem squashing and bending. One of the exceptions is the gal in the back left corner. She's in a 3 gallon pot, while everyone else is in a 5 gallon. The smaller pot has not made her slow down the stretch. Unfortunately, what keeps height down makes them branch out.
These are all from seed. It's pretty clear that the gal in front-center would be happy to take over 1/4 of the tent or more, but I have no idea if I'll like any of these. (I'm pretty sure I'll like them, but that's the case whenever I'm growing something new, and it doesn't always pan out.)
Now that I posted this pic, I can see a lower branch or two that needs to be removed on some of these. I'm talking to you, lower branch on the gal to the right.