You can add more. Ideally you want to start them in the pot they’ll finish in with time released nutrition.

Not much you can do to fix what’s done but you could bend over those tops away from the light.

Bio-Bizz is complete mineral nutrition. You can use supplements like Recharge with Bio-Bizz.

The genetics are the genetics when feminizing. You’re not going to introduce any genes that are not already there when selfing.