Okay, so I smoked a bowl, have another one loaded, and I'm copying what I type as I go this time! I write a lot as well, but it's because we dig what we do, you can't talk about it without hearing passion, you can't write about it without expressing that passion. 2 4x8 tables with 2 1k fixtures is pretty standard issue, so you should be dandy. I love that you trim in a room with lots of extra HID's too, I always hang up HID's in the room I'm trimming in if I have to trim more than a qp, my eyes start to hurt real fast and then it's just a struggle without the HID lighting.
As far as the Big Mamma's, I always recommend presoaking your blocks no matter what size for at least one day. I know it can be done in a matter of minutes for the most part, it is best to be able to monitor the pH over a course of 1-2 days and makes sure nothing funny starts happening. I do this with my peat plugs and when I did hydro I did it with all my blocks of all sizes, I never used blocks as large as you do though, I was in DWC with smaller plants. But you only have one chance to give your plants a fantastic start, after that, all you can do is try and correct it with a fantastic follow through, but nothing beats a head start off the line.
I believe you can absolutely get a living medium going in your rockwool cubes, you use your cubes more as a soiless medium than anything, so you should be able to get away with it, I don't see why not. I am currently rocking BioBizz as well as brewing my own tea's, I highly recommend both, nuts to buying store bought, prepackaged teas. VermiTea is great shit, no doubt, same with BounTea, but nothing beats your own made with a excellent recipe. The BioBizz is so far preforming very well, I bought all the parts to it and most of them are hydro safe. I don't need any extra ca/mg, I don't even think I need silica, but I still add it anyways. BioBizz is a complete fertilizer and so far into this grow, everything is up to par with the House & Garden complete line up. Last round I only used tea, my custom soil mix, and one application of shooting powder, which I shouldn't have done, fucked with the experiment. But my yields were still near the same, give or take because of the plant size, and the smell, taste, and smoothness of the smoke was amazing, even after a very short flush... which I guess was pretty useless with a lot of the stuff I put in the soil anyways, lol.
When I am done with the pure BioBizz round I will let you know. I am doing it with both living"soil" I made from a Sunshine Mix #4, and then plain Sunshine Mix #4 as well, I will let you know the results on the plain sunshine side of the room. So far I am very impressed with the BioBizz product, and the customer service is fantastic, informative and a sense of humor. I would shoot them an email about your ideas, I know by the next day they will have a excellent response, they are on dutch time. I went organic because dispensaries were more demanding of it, so far I have not regretted this decision, it makes everyone happy and has been an amazing science experiment for me, so much fun. But be damn can earthworm castings burn up a plant, I thought they would be much more mild! lol.
Right now I am using the XXXL Magnum hoods with 600w's, and I am getting a 3.8 x 3.8 foot print with great growth! They have lousy light penetration though compared to other hoods I have used, they are best for plants around 2ft in my experience, but I'm going to start using a few larger plants and see what happens. I can't get too tall in my current set up though. I really like the Yield Masters II's best so far to be honest. Just good for all-around applications. I want to try the Block Buster hoods though, looks like you have a few in the veg room, actually.
Organics takes a lot of adjusting too and you will have your fair share of overfeed or over watered and even underfeed plants getting the whole "Living" medium thing going, but once you do it's worth it. Tea makes everything so cheap too, and the flavor of your end product can't be beat! Really brought the OG flavor out in the SFV OG (Swerve's remake). Pure Lemon Diesel Funk. So far I have not seen any wimpy colas in my garden either, nothing but over-fattened colas!
And now I continue the smoking