Hi there Iheartcannabis, sorry i have to disagree with my growmies on this one. You can tell you have a P deficiency by how the yellowing is happening and the fact your plant needs more P in flowering. Usually in flowering you do want to be adding extra PK from the NPK otherwise you can get this sort of yellowing happening. Plus if you check you're already adding a bit of N through what you're already giving it . So it's really the P part that's important to feed extra of, for you. Try adding a PK booster. Hope this helps !