Ogwisher, Keep hitting it with the 20 20 20 right through to the last week or so that your going to pull them. They should only need a good week flush, as they will be maturing all through October just start flushing a week before you harvest. 20 20 20 is what I use for veg and also in bloom with only the addition of Molasses ( cause they are cheap and add 20% more bud growth, as well as extra Trics/potency apparently), and Monster Bloom ( Which I just started this year) other than that I used to always use 20 20 20. I find if you have a good brand that contains trace elements of all the other plant ingredients (other than NPK). I find it works, less is more in this hobbie, don't let people tell you that you need a hand full of different nutes it's just plain bull shit. As long as your Nutes contain the main ingredients NPK and trace elements of all the other (cal, mag etc) sources of energy/food for your plant, I know you can have a decent harvest that will rival some of the best Over fed plants out there. Good on ya Bro