These two are getting close. Peyote is getting super frosty. The Peppermint Kush has turn it on this week and the buds are really starting to fatten up.
There seems to be something wrong with either the pH of the soil or roots... That looks like burning of the leaves... I had this a while back due to a cold snap, caused shock in the flower stage, was able to save them.
Cut those dried and dead leaves, try keep the light away from the buds and leaves. Looks like a very awesome grow by the way, just my two cents.