I finally started flowering!!!
I transplanted to a bigger pot (8 1/2") and started the 12/12 period all in the same day. I watered it with adjusted tap water at 7 pH and 1 drop of Superthrive. I also flushed the next day because the runoff from the soil was wayyyy too acidic. I can't know what it really was because it came outside the range of colors of my dip test... too yellow.
So I flushed at x2.5 the volume of the new pot with ~7.2 pH, but my runoff pH dip test did not stop being yellow!! I don't know why it wasn't coming down enough to be inside the scale range. So I just stopped because I had to go to work. I watered it with nute/water solution when I came home.
Now the plant is looking pretty good. Calyxes are coming out everywhere with two beautiful white pistils sticking out!!
The pH seems too low (unless my fish pond dip test sucks balls...), but the plant keeps growing at a healthy rate and the leaves have perked up quite a bit.
Could it be this specific strain likes lower pH levels?