I wouldn’t stress shocking the plants transplanting. Even autos as mentioned before. If I was running a auto and after my first transplant.. she begged for more than 4 weeks without pistils showing, I may go up a size. By then roots should have the place surrounded behind the walls of the pot. I’ve seen some pretty big autos, so I won’t ever sleep on it again. Here’s a link with some info on it if it intrigues you.
Thor’s Hammer XXL F4 was breed with passion to bring the best Thor’s Hammer Autoflower this far ! We pushed it to an 80 seed hunt of THF3 and found both the male and female that both were over 5ft tall with vigorous growth and stout thick...
en.seedfinder.eu
As far as the space in the middle of the room.. do you have a cloning station set up? Or care to have one? Some tables, trays/domes/heat mats & floro’s and you could have yourself set to fill a tent space quicker than usual. Should help with turn around time.