Finally split up the plants. The big auto has the 2x2 shower to herself now and the bathtub is plenty big for the smaller auto and the vegging bag seed/"mutant". Add the bath tub to the list of domestic areas in my home that Mary Jane has claimed :P
Removing "grow big" from the nurse mix, despite it being recommended in the nute guide provided by fox farm that came with the trio I've been using, seemed to do wonders for the stunting/Yellowing. Unfortunately the top leaves on the bigger auto wilted seemingly irreparably (except for the middle one, like it's flipping me off for putting it through some rough shit >.<). All the other leaves perked back up and are in the process of uncurling.
Thanks for all the answers, you guys. I'm gonna run a flush on these babies tonight or tomorrow. It's been 48 hours since their last watering of 1gal in a 5gal pot, so they should be good to go.
Wish me luck!