If you fed her plain water that is perfectly fine bro! When you watered do you get any runoff? Not that I am worried about ph but just so we know you are getting a good amount of water through them this late in the game. From the looks of it, that soil looks really dry on top. You want to cycle from wet to dry but you don't want it to dry out too much before you water again. This late in flowering you should probably be watering close to every other day if not every other day. They are going to be drinking a lot, transpiring a lot and those buds are going to be swelling a lot. Don't skimp on the water during late bloom.
As for the yellowing, I know you want to correct everything that happens with every leaf but some of the larger fan leaves are going to being dying off and mostly it is going to be the lower ones. That is absolutely natural and nothing to worry about. The overall health of your plant still looks wonderful, I mean really excellent compared to a lot this late in the grow. Soooooo, don't go adding a lot of different nutrients trying to correct just a few leaves! You watered today which is good, give her two days and hit her with some bloom nutes again. 1/2 - 3/4 strength. When you do feed the bloom nutes make sure you are watering her thoroughly and getting some good runoff. That will continue flushing and replenishing with fresh nutes. If you are going 80 days, you need to start planning out your flushing cycle. That needs to start somewhere about 2 weeks prior to your planned harvest. That means probably only one more feed since today is T-16 days to 80. Think about it, it is coming up quicker than you think. I don't see any problem at all with hitting it 100% bloom nutes on the next feed and then begin flushing her down. She will continue to use up the nutes in the soil and begin pulling from those fan leaves. Should be spot on at that point.
Hopefully I didn't overwhelm you with too much info.
As for the yellowing, I know you want to correct everything that happens with every leaf but some of the larger fan leaves are going to being dying off and mostly it is going to be the lower ones. That is absolutely natural and nothing to worry about. The overall health of your plant still looks wonderful, I mean really excellent compared to a lot this late in the grow. Soooooo, don't go adding a lot of different nutrients trying to correct just a few leaves! You watered today which is good, give her two days and hit her with some bloom nutes again. 1/2 - 3/4 strength. When you do feed the bloom nutes make sure you are watering her thoroughly and getting some good runoff. That will continue flushing and replenishing with fresh nutes. If you are going 80 days, you need to start planning out your flushing cycle. That needs to start somewhere about 2 weeks prior to your planned harvest. That means probably only one more feed since today is T-16 days to 80. Think about it, it is coming up quicker than you think. I don't see any problem at all with hitting it 100% bloom nutes on the next feed and then begin flushing her down. She will continue to use up the nutes in the soil and begin pulling from those fan leaves. Should be spot on at that point.
Hopefully I didn't overwhelm you with too much info.