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I would avoid using the superthrive as a continual additive. Only add it when your plant is really sick or transplanted and needs a boost. Also, I have heard it can have adverse effects on taste when used in flower, but I cannot validate that. I do know it stinks like shit.
I think 206 is right that it needs more N, but I would flush again since you said that helped, but that the problem was still worsening. That clawing on the upper fans and the wrinkled burn look of those lower fans looks like toxic salts buildup or it could be the result of the hormones in Superthrive, if it does actually have hormones. Whenever I have a N deficiency, my leaves usually just get pale and limp, they don't get gnarled like that. Maybe you didn't flush quite enough the first time...
Yea you bring up a good point about the soil too. Usually by the time I get to flower, my soil area shrinks up as the roots grow through them. For whatever it is worth, I always fill in those gaps if the soil has pulled away from the sides of the pot, and cover up any roots that may have grown through the surface with a couple inches of fresh Ocean Forest. I figure this adds some more healthy mychorrhizae and the other beneficial micro-organisms in Ocean Forest. I don't know if there is any logic in it, but I do it, and it seems to help. I was wondering what other peoples thoughts on this were.