Well for a few years now I've had the same problem with every grow.
I'm not exaggerating either, this must be the 3rd year it's been going on.
The only thing that's been kept constant is my water supply.
Unless anybody else has any other suggestions?
Peace
Well. fuck.
I wish my healthy plants looked as good as yours.
Anyway, there is nothing wrong with wanting what you want,
but even if you close shop now, you'll soon find frustration
from unknowns in other aspects of your day to day.
Time to hunker down, fix it, and go from there.
If you switch to coco now, there will be more variables
to iron out, and your plants may spot out again. Not
the best case, but you will have the diversion from the
issue you have now.
Before you change anything, get your tap water tested
like what's been mentioned before.
My opinion, I use a simple cartridge type filter under
sink mount for my cold water supply. I change the filter
every 4 months, and the EC is 0.1.
Also, your plants may have caught something from your bathroom, lol
Good luck, we're all counting on you!