your plants look right on... don't worry so much about the yellowing, I stressed out the first few girls i grew... I was so worried that she wouldn't make it another few weeks. She will... She looks a lot like the sour d I grew, Sativas seem to be a little more fragile in my experience.
I'm sure you have heard this but when it comes to nutes, less is more!!! if you feel you need to add a small shot of veg nutes with your flower nutes, do it, just not too much. I like water water water nutes water water water nutes... MJ is resilient. keep up the good grow. stay high