Have you tried a block or a line of four Apartments together? You can monitor the specific side that is the heaviest burdened and replace them with a Habitat if necessary, especially as they only take up the same area as a footprint and allowing for more people per square. Can't think of anything else to suggest other than decent city planning for the future. You know that already by the sounds of things anyway. I'm sure they'll tweak it up in the mothership if it becomes necessary.
There are several good quotes that come from Frank Herbert's Dune and I recommend reading or seeing the film again but here are just few for now:
A beginning is a time of taking the most delicate of care that the balances are correct.
Never sit with your back to an open or unlocked door.
"I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain."
The power to destroy a thing is the absolute control over it.
He who controls the spice controls the universe!