Sorry guys I was up to my eyeballs yesterday so couldn't delv in, I'm here now and I'm going to get you growing some fat plants. Now you have seen the schedule you now know with Plagron light you can start feeding from day 10,this early start with Photos or Autos should get you big plants. The plants you have now look very healthy so would be a shame to pull them, I think with 2 weeks feed we will have some nice plants ready to flip to flower.
What nutrients do you have now?
My advice to get the best out of autos in your space would be first and formoast good genetics and I'm happy to point you in the right way there, I would then get 16 15-20L Airpots and grow 4 plants under each 600w light....if we can get this dialled in (I'm no HPS expert but will try) we should be getting you 400g at least from each light so that gets us close to your 60 zips. If you want to maximise your space and the sky is the limit budget wise I would still grow the 16 Autos but I would have a HS1 over each plant, then you could get 150g+ off each plant so more like 80 zips.