First time Hulkberry

Defoliating will harm your plant and not help with making it bushy, just the opposite in fact. More leaves = more energy being made = more growth. Less leaves = less energy being made = less growth. "Tip pruning" if you are growing a photoperiod plant may help, but if you are growing autos, just use LST and let the plant do its thing. Good lighting and proper care is the best thing you can do for your plant, there are no magic techniques or short cuts that will turn a normal plant into a "super" plant.

Plagron Alga Bloom NPK = 3-2-5 + amino acids and algae extracts No micros "not a fan of no micros at all or secondary macros like Ca Mg S Bionova Soil Supermix NPK = 7-3-6 + Micos and secondary macros Alpha Boost NPK 0-0-0 from what I can tell, and contains a lot of extra like microbes and PGR's, im not a huge fan of PGR's they seem to be derived from natural sources vs synthesized but hard to tell and I don't know to much about the difference between the two. I like this prduct for its other aspects with regards to microbe boosting life but not its PGR's I would stick with the supermix and add in a PK booster with micos to make up the difference, and if you need it, continue with a microbe booster for the plants but maybe not the alpha boost. or use it up and then find a new one. The brand Bionova has a Micromix that could be usefull, as well as Vitasol that can boost microbes. these is also X-cel but it looks to be their version of alpha boost and main contain more PGR's I think the easier thing to do is use a pk booster and turn that feed into something more flower friendly. Eg a 1:1 ratios of supermix + pk boost would yield a npk of aorund 3.5-8-10 and that's not a bad ratio at all. Can always add in a bit more super max one week if it looks to be lacking on N. Plus add in more micros if its needs it if you get that product as well. a 2:1 supermix+pk boost would be 4.6-6.3-8.6 also not to bad. Good Luck!

Looks a bit like magnesium to me. I don't think its P and doubt its K, but maybe. So stick with the Mg and see how it does in a weeks time. It will take time to green back up. Can also use epsom salts as a source of Mg and S for the plant. It should not progress but if it does it means it might be something else. The hint of brown tips also might be showing they are being overfed something else. So dial back some of it. https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg Good Luck!