If you were concerned about the yellow leaves. That's normal. The plant doesn't think they serve a purpose anymore, drawing stored nutrients out of them. Wait till they drop on their own (don't be a muthaplucka). Maybe more nitrogen would be good. But, it doesn't look like the plant's deficient.
EDIT: I saw the rest of your post between the photos. You asked about the burnth tips. Yes, that looks like you fed too much.
They look great. Maybe reduce your nutrient strength 20%. If you're following a schedule, maybe go back to when the N was a little higher.