You could check your Soil-pH and DLI, from the pattern it could be llight.
I dont see a problem in your feeding if your diary is accurate.
Just my opinion, but I wouldnt cut nutrients completly just lower the dosage, you have to see them as a living organism. They get used to dosages, ph, light, everything. With organic nutrients it may work, but with mineral nutrients that work instantly i doubt its any good to go from 100 to 0.