Cool, I subscribed. I have one of the exact same plants going in DWC also. I've been getting odd discoloration of a leaf and another strain in the same tank is fine. (running two in a large tote tub) The jack horror auto seems really finicky to me, or I got a weak one. It's kind of been a runt and sickly from day one although the other strain started the same day has been in the same conditions and is 3x the size and healthy looking.
I agree with you on the nutes, I had to cut way down on the recommended to about a 1/4 strength and mine is 31 days old.
How old is yours?