Blockhead grow

I am going to attempt to keep track of a Blockhead grow, if anyone sees me making a bad move please chime in, this is my second run of BH, and it's being done using seeds I made from the original sol bh, sort of a test grow to compare to the originals.
First the setup or part of it, I will add more to it as I get farther along.
76"x76"x76" tent, full line Fox Farm nutes liquids and powders, I use Fertilome Ultimate Potting mix for soil, even though it works more like coco, I have had stellar results with it. every 2 months I will be using oregonism mycor and my feeding schedule will follow the FF schedule with only minor changes as I think they are needed. I am starting off under 10 300 watt cfl's they are the cheap ones from home depot, and they work pretty good, a little warm for veg, but I will also be using 8 t-12's to add in more blue light. Flower will be under 1 1000 watt with a hortilux bulb for the first 2-3 weeks, then I will add in a second 1000 if I notice shading. This is the initial plan, and as soon as these seeds germ I will start tracking the growth rate and attemting to post pics of the grow.

I am now one month into veg with the blockheads and for some reason they are starting to sex with 18 hours of light, the originals did not auto flower so I am unsure what is going on with this run, I have one confirmed male and 18 confirmed females and 31 plants that are not showing any sex yet but are staying fairly short with only 1/4 inch node spacing yet they are loaded with branches, if my camera would work I would post pics, but if anyone has any idea what may be happening please fill me in, I have never had a grow do this before. The nutes so far have only been FF grow big, and oregonism with a tsp of molasses per gallon.