Anyone here ever find that overfeeding PPM shows up as lock-out/deficiencies or excess symptoms?

For the first time in a while I am going to try and give my Plants exactly the amount they consume of nutrients and no more! in Flowering.

This is what I try and do in Veg but for some reason since they drop their nutrient drawn down by over 30% after the flip, I have a hard time going that low i.e. 600 PPM

This is looking to be around 600PPM and no-more. IS there any reason except maybe a smaller reservoir to go above the nutrient concentration that they are consuming in the exact ratio of water/nutrients?

I.E. At 600PPM .5 conversion checking the reservoir the next day before considering a top-off I get exactly the reading that I started : 600 PPM ???

This is hard for me since I convinced myself the Potasium Deficiency I get in Flowering is from "not enough" potassium?

you should feed at whatever ppm will give you a slight drop every day. ppm and water level dropping daily is good