MPK Auto & 2Gum Auto first grow

Week 4 is finished and all 5 MPKs and 4 2Gums have gone into flowering. Two of the MPK's are really bigger than the rest of the lot, I wonder if it is because they're mainly sativas. I am not really sure if they are suffering from light stress because after about 12-13 hours of light the usually start to droop. But everything's fine after they had their 6 hours of rest. They're all looking quite happy and they start to develop some nice bud spots. I started to feed them some nutrients (about 1/2 of the recommended dose). We'll see if they take it well. I also stopped watering them everyday. Now I water them ever 48-72 hours, depending on the soil. I think it works well for them. As I haven't done any LST, I know that the yield will be smaller, I already see some spots that don't get any light, but I'm still quite happy with everything so far :)