your plants look at little nitrogen toxic. See how the end of the leaves curve like that, before even the tip but the curve is illustrative of toxicity.
I have found a company out of Texas called Microlife that has a humic/fulvic acid complex that is 10% humic 5% fulvic at a very good price.
lovely mate, super work. Some strains get claw leaf anyway, they look super so i wouldnt worry :-)Here is a photo from last night. Almost on week 7 of flowering. Trichomes are just starting to turn opaque from clear. No Amber yet. You can see that the claw leaf never cleared up, but doesn't seem to be hurting them.
The bottle shown above will work and seems nicely concentrated. You can also order humic and fulvic from kelp for less at reasonable prices too. If you make your own worm castings you will also make humic acids.
That product seems good for an in the media product. While it will work foliar wise it is not really ideal and seems to be more of a product made for an all in one aspect. When you see this, their are typically compromises made in terms of efficiency to effectiveness but this does not mean that it is bad. More like in cars, stick shift verse automatic. By the amount they have I am not sure if I am comfortable insinuating it is less effective to the degree we would visibly notice.
When transplanting next time, about a week before transplant and after transplant for a week or until the plant gains its feet give the plant b-vitamins (superthrive works). This will work to reduce stress from the plant and should be done any time the plant goes into a stress situation, transplanting, transition to flower etc.
I prefer to boost nitrogen if needed via worm casting or guano top dressed if necessary. Never in flower as if you give to much nitrogen you put out of whack and the plant will take longer to flower and less dense buds.