I think you should be running at least (16) 1000 watters if your trying to use the whole 20x20. Supplementals wouldn't hurt either. Some nice bare bulb 400 mh finishers or something...
If I had the space like yours, I'd be jockin REMO's style. He has an affordable nutrient line too. Developed for a similar style grow. Your doing bare bulb tree style as well if I remember...
Now that j see ur running hoods, I'd recommend individual scrogs for each plant
Try ditching the hoods, and getting a bigger mini split. Get the bulbs in the canopy. Just watched your vid, and with those plants, you should more aggressively lollipop, and get them up closer to the lights... That's my opinion and constructive criticism sauce boss.