They look great! That yellowing is normal and by late flower should barely be a leaf left if done right. Many here feed em up to the end and it confuses plant as in nature buds are made from storehouse in leaves. Actually can get bigger buds by letting buds take what they need from the leaves. Also, late feeding can cause many strains to delay amber trichs (indefinitely as long as fed) thus never reaching full potency/maturity.
Big conspiracy to brainwash newbies into some expensive additive schedule but nitrates taste like crap and whatever else is in there.