Just going by your test results I would be concerned that there is not nitrate (NO3) showing. The plants are using all the nutrients that you are adding with the fish food.
Fish food usually has a pretty decent balance of N, P, and most micros. Not so much K or Fe, so the Leaf Zone and carbon supplements are just right.
Yes, I would add Flourish Comprehensive to add just that little bit more that the plants may need.