How much should I feed plant?

growing in fox farm ocean forest
1000w hps 600w led 2ft above plants
Feeding roots organics master pack 5ml per gallon
Now I’m using organic nutrients but not necessarily growing 100% organic I’m using dechlorinated tap water and adjusting ph when needed to keep it around 6.5-6.8 I haven’t been having many problems (knock on wood) but am now getting my fair share... I didn’t feed much nutrients in veg I let fox farm do it’s thing and I went very well into about week 2 of flower I started to see chlorosis so I did some half feedings 2.5 ml per gal and just recently in the past few days the plants got hit hard with some def... so I did a full feed 5ml per gal and checked ppm came in at 550 ppm.... now I have been told that ppms do not matter when growing organics and to just stick to feeding schedules... long story short any suggestions on what I should do ....feed more ? Actually go by ppms? Are the plants just hungry strain ? Thanks in advance

I'm not experienced with growing organically, but I am familiar enough with them to know that they require microbials to break down the raw organic materials into usable nutrients. Have you done anything to feed the microbes living in your soil? I've heard of many people using something as simple as Backstrap mollasses, and there are also buy-able products such as Great White that you can apply to the root zone, though I'm not sure how much the Great White actually feeds the microbial life compared to just adding more.