Have you topped any of them yet? They look way over due for a topping. Old growth that doesnt get any light tends to die off but you might be low on nitrogen?
Yea I’m feed the sea grow nutes 16-16-16
I did FIM the lady around the 5th node. I’ve been feeding it every 2 weeks but maybe I should do every week now ?
The first set of pictures could be over watered. My plants are in the Desert and i water every other day but your smart pots are smaller than the ones I'm using. The wrinkled leafs to me are a sign of over watering.