Ditto here.
Not sure if you'll be able to recover a branch that's snapped off completely, but it's worth a try. MJ is a very resilient plant. You'll definitely have to watch for hermies now, though. Seems like they've experienced more than a few stressful times throughout your grow.
Reminds me of my first grow...four plants 5-6 feet tall each in a 4x4 foot closet. I dropped quite a few things on those ladies (fans, shelves...even my HPS light fixture one time) and they still gave me nearly 5 oz of tasty buds.
Good luck...hope everything works out. You still have a few plants that escaped injury, so I suspect you'll still get a decent amount of very smokeable bud from this grow, regardless.