I know it looks like nitrogen but I dont say it is the case. The girls look healthy to me with a monor burn on the tips from nutes, we all get that from time to time. Don't stress it...its a plant and it will grow. You are on track. Keep it going and if anything try cutting back on your nitrogen feedings where you are in flower. The yellowing you see could be from the plant using the nutrients it has in its leaves. Keep an eye on her, feed her well but not too often, and as extra safe guard I would feed her PH water right from the tap with no nutrients. This will help reduce any issues you may see.
Everything looks great, keep it up and look forward to see the finished product! As always, if ya got a question hit us up!