When you were doing 1 per light for how long were you vegging? 4 weeks?
I wish lol... from seed theyll have more vigor but large rooted cuts is another story... really depends on the strain. More strech will be less veg. I did a big bud vomb cross before too, still got that in my garden too. If you inder veg itll only hurt yeild... i use to veg in 5 gallons until they were almost rootbound, 30"x30"x30" then i would transfer into 20 gallon and give 10-14 more days.
If u try to veg for 4-6 weeks youll only pull 12-16oz compared to a 8-10 week veg thatll give you 24oz. But then again i cant remember if i vegged under 600 or 1000w back then. Now i veg under mostly t5.
Your setup will be pretty easy to dial in. Its the strain you have to watch, the fan leaves tell you everything.
With the right strain in the right enviorment i could see a 6-7 week veg possibly pulling that kinda weight but then again its always better to over veg.
I usually went 8-9 weeks to pull 24 oz. And i topped them aggresively n ran into mesh screen with pvc frame. Also another lesson is i only used 48x48" screen. If you did 60x60" youd pull more. I had close to 100 tops each sometimes more. Start shaping immediately and plant your girls super early for next grow. Cant over veg...
I know your just starting this grow and eagar to see some cash but dont take shortcuts like under vegging or quick drying. Itll really hurt you in the end and are two biggest mistakes i see. If anything pull a plant a week or two early if you need the money. N always pay your electric bill first. I dunno what you kwh rate is but when i run 16 lights where i am i avg about $1000 month and thats on the lower end. I pay 11.5 cents per kwh and use close to 9,000 kwh month.
Also i highly suggest drippers. Youll be using 50 gallons of water a day when they get big. If not more with that ac.
I seen some return systems that filter out your ac runoff so you can return to rez but your grows not that big... but big enough lol. I think youll pull 20 at first no questions. Maybe 24.
Also i would setup one single distributor.
Im around if you got any questions...
Hope those girls are already planted...
Keep me posted!