Outta likes right now 
but looking great @8k_feet!! 
I still have to double check the thread to make sure I’m not in one of Lefty’s 
haha, pretty crazy how identical your setups are.
I grow organic in soil so I’m pretty much no help here 
but it seems like they’re just sucking up a ton of water and not as much nutrients. It’s the only thing I can think of that would make the EC go up like that, it’s getting concentrated by the amount of straight water the plants are drinking.