I just ordered mist emitters with a higher gph and 10 more Dutch leach trays. The first lid was a prototype. V2.0 will have more windows that will allow me to view the chamber better. The trays are fairly thick, but the plastic is soft and easy to cut, so won't take very much work. From here on out I want to get my clones into the boxes to become as densely rooted as quickly as possible. Then once I put them into flower they will be able to hulk out unrestricted.
Also I realized that my tap water has fallen back to winter temperatures, so I started pouring a few buckets of hot water into the res when I refill it. I think that will help a lot. I have the environment locked in pretty well now. I need to lower it a little, but it's 79 degrees in the tents at 5:20am. It's 26 degrees outside and normally the temps would crash through the night. It's amazing that they never caught powdery mildew. So a heater plus automated vent fans is huge. I still need new lights, but there's not a whole lot left to upgrade after that.
Lastly I increased the Floraflex from 1g a gallon to 1.5-ish. I'm giving them 10 400ml water cycles and they don't seem to be drowning. I think I'll need to cut back a little after the stretch. I'm looking forward to using loose rockwool chunks instead of slabs. I don't think it will be possible to overwater, and I may be able to do more cycles while using less water overall.