about the 12/12, wait until your plant has reached half of the size you want it. Then switch. It will still grow another half while flowering.
About ur humid problem... dunno, maybe put a larger container so it evaporates faster (more surface, more evaporation.) put a cheap BUT SECURE heat...
Looking good!
I got about 50g (dried and cured) on 2 plants with CFL with the same kind of setup... Can't wait to start my 2nd grow!!
Keep the good work.
The Humidity in your box is too low, that's why it dried so fast. Try putting a couple glass of water around, this will saturate the air in the box and help your RockWool stay humid.
Forget about the fans until they sprout.
Also, I had seeds in a germination device (humid towel folded over...