plant is healthy. learn a baseline before reacting to something you feel might be wrong.
those magical products that you use at particular times are mostly useless too. It's over-sophistication to make people feel like they are doing something useful. I guaranteed if they had the balls to compare results in a scientific study, AN and the rest would look like retodds and more than willing to exxoit their customers for financial gain.
Besides a healthy plant there really isn't much you can do that genetics does not control 95-99% of outcome.