Hey masonman, I am using Jack's Classic blossom booster, 1-3-2 for flowering and love it and the results. Jack's is great stuff for a chemical fertilizer. Only using the highest grades of ingredients and if you notice the nitrogen is in two forms, I forget all the techno talk. I would prefer not to use a 20-20-20 but I'm pretty sure it won't hurt. My only concern would be the high phosphorous during veg. I've read in a couple of different places, uncle ben being one that to much P during veg is what causes stretching. I just got some dyna-gro stuff with an npk of 9-3-6, haven't used it yet but I'll report the results when I do. Just got done taking some pics, here they are at almost eleven weeks. The sour cream got chopped sunday, I'm letting the bottom half of the plant go another week or so. I'm thinking maybe another week for the strawberry haze and two more for the malawi 99 and the arjan's haze.