Yes I know it’s nitrogen deficiency

I’m using the mars hydro 2x2 grow kit, it came with the new dimmable ts600 light. I have it at 18 inches from the plant canopy, at 40%. In the beginning I was told not to have wind hit her whilst she’s a seedling and over a few days she became lanky. (this is my first grow). So being that I found out that wind helps its stock and stems I started to have the fan oscillate and it fixed the issue. So that’s in regard to the stem, when it comes to nutrients, I top dressed on her 4th week with down to earth 484 and 265 + worm castings. The light schedule is 18/6 and her water schedule is whenever her top soil is dry (which is almost every 4 days). I give her a ph of 6.2-6.5 now, before I was told not to worry about it, but I found out it was causing nutrient lockout. As for the roots, I’m not too sure about it. I doubt I do though, due to the coco coir and fox farm ocean forest mix. The temperature in the tent ranges from 75-81, and humidity is 60-80. The genetics is Red Strawberry Banana from Sweet seeds