That's really great for a first go, if you took clones you could really fill that area out in the next go with the best females. That would definately bump the yield up a quite a bit as they'd have a more homogenous canopy. Repotting would also probably increase yield, I think 2 gallons is a little small for plants that size and by the time you get into later flowering you're gonna have to water them daily which is a PITA. If you can go to 4gal containers It'd probably help. They look nice and healthy so far.

peace