You're letting your soil dry up too much and to quck after feeding. When follow up feeds should be breaking down your feed the roots are suckin your soil dry with large EC in soil
.its why your plant looks like that
Fix for soil: 5-600 core npk feed after you feed follow up either with root stim or enzyme to help nutrients that are left in ur soil or at least DONT LET your soil dry up and feed with water. The uptake won't be as good without an enzyme but it won't cause burns like that. How I know it this.. you have burns with leafs that show defs. So after the plant got burnt suckin up the high ec nutrients from soil in 1 go to feeding on itself then from them been unable to take any feed as the soil got to dry. Keep it moist
If u need help. dm me.