Hey pal.
So, from looking at your diary.
And seen the amount of products you are using.
Id be putting it down to imbalances in PH.
As you don't have a pen. I'm assuming you don't do yours.
Also, all them things, you don't give in 1 go do you?
If so, break it up a little to maintain a more stable PH.
Like a root stim and other enzymes should bring your PH down some to match the core NPK stuff. Really hard to do right with a pen.
But will help some. As if your water feeds are way off from your feeds then this could be ur issue.
Good luck!