Thank you for the comments everyone!
Tonight I have determined that we are about 10 days from flower. Lights have been on 18/6, but today we switched things up a bit. The 600w MH is now on a 12-1 GLR schedule, and the 600w HPS is set to come on for 2 hours right in the middle of the "day", again to simulate noon.
After examining the results of my last run using ever decreasing lighting, starting at 11.5/12.5 and then steadily working my way down to 9/15 at the end of the grow, I have determined that there is still room for improvement. Seeing that some of my plants seemed to stall out at the end, I am not going to go all the way down to 9 hours of light this time, 10/14 will be as far as I go.
Right now I am pinching off of the growth tip on every branch, doubling the nodes on all plants. Another 10 days should produce some very bushy plants, and probably all the tent will be able to support without diminishing returns due to lack of penetration and air flow. This is my goal on this round... to max out what I can produce in this space.
So far the organics are working very well this round. The supersoil and base soils have all been cooked for about 3 months, and this time the plants should have built up a large colony of microlife. Everyone looks incredibly healthy, leaves are thick and a great color, and growth is vigorous.
Our LSD was last watered with an AACT 8 days ago and was watered again with another AACT today. She probably could have gone another day before wilting, but the lift method indicated that it was time to water, and the AACT was at its perfect 48 hour mark with a very nice foam on the top. Each 5 gal smart pot took 1 gallon of tea, roughly twice what it took last time to reach run off. I expect the wet/dry cycle to reduce to 5 days this round and for water use to increase yet again on the next watering.
It is also dramatic looking at the difference in growth between the 7gal and 5gal smart pots. Already at this point, much more rapid growth can be seen in the larger containers, even though they were built using the same layers and the same soil mixes.