Gorilla Zkittlez & Sour Diesel

I am currently at the 3rd node this week and next week I will be topping yet once again to get my 8 main colas. I am noticing that the Sour Diesel will be extremely picky with feedings compared to Gorilla Zkittlez. I say this because I am noticing very slight tip curl and the growth is not nearly as explosive. I have not added any nutrients aside from SLF-100 and Great White combined with black strap molasses. The soil is Happy Frog Ocean Forest and that seems to be quite hot only for Sour Diesel. I am unsure which plant is giving off a very nice mild odor, but I am going to guess it is the Barneys Farm Gorilla Zkittlez. Something smells sweet and pleasant. The odor is not permeating from the grow tent; I just get a very slight waft when I am in there watering and taking care of business. I am still feeding 1 litre every other day. PH seems to be going in at around 6.3 and the soil PH seems to be roughly 6.7-6.8. One thing I am wishing I would have taken note of was the run off with a TDS meter. This would have given me insight as to when I should transplant again. Lesson learned for the next grow I suppose.