I am now officially NOT recommending fabric pots. I know people use them successfully, but most of the problems I see are with roots and nearly all of those folks having trouble use fabric pots.
I haven't ever had those types of problems, and I've always used hard plastic. My helper in the garden also uses plastic....no troubles with roots there either.
As for the Cat Drench, put it off for at least a week, perhaps skip it all together since the plant is showing all kinds of stress, like 3 bladed leaves, etc. Do you possibly have a light leak? (a big one, not a little tiny pinhole type.) Go inside in the dark cycle and see if anything gets in.
I recommend vegging in 1 gallon, then upcanning to 7's or higher. I bloom the same day I transplant. Grow some strong, study roots that don't get killed by air pruning and in soil that isn't disturbed by picking up the pots or moving them, etc.
I think a lot of these issues will go away. They're due to containers and the difficulty transplanting from felt/fabric, and the fact that roots are always dying off.
I'm officially not a fan of fabric pots! That doesn't mean you can't use them successfully....it just makes it harder and roots don't grow the same way.