Your set up is perfect for auto flowers man. I think you should give them a shot in the future.nice teflon!! there so short and bushy, i want mine to look like that when they start out, LoL. great job bro!!
A gallon and a half is what I use and most auto growers will say to try to go no lower than 1 gallon.
Thats what I am on now. I am going to start on 20/4. The breeder, Stitch recommends 18/6.