It looks like your creeping on week 5 right now so i believe the yellowing is okay at this point. Just keep the feeding regimen as it is or give it just a tad bit more of some grow nutes just for the lil bit more N. I don't like to give anything else but bloom nutes after week 3 because N can make the plant herm if given alot. Your girl looks great just trim off the dead leaves once they dry up so make the drying/harvesting period alittle earlier.