Most breeders recommend running 20/4 for autos but I have grown them under that and 12/12 with good results. Supposedly you'll have better growth rates and yields with more light but idk, I got pretty big yields on my autos both ways.
Did you mean FF OF maybe? If so, you don't need to add any nutrients for about four weeks.
The autos look a bit behind to me but still good. The bag seed plants look really good to me, very nice.
I've been getting that same yellowing on all plants in FFOF lately and doing nothing different from before. I don't know what has changed but I think something did.