I know the leaves will turn yellow and die on their own at some point. My concern is that it started in the first week of flower. Then they ended up with the other problems that I have pictured. Those pics were from about 5 or 6 days ago and they are actually about twice as bad now. I think pH was def part of the prob but being as I never gave them N in growth phase, I'd think that they are definitely lacking. They are at 30 days and should have another 40-60 to go. I'm not sure they'd make it off of their leaf storage that long.
They will be fine. Yes they were defecient early cause you had no veg nutes and than you had a ph to low and had lock out. The main concern now that your ph is correct that you do not start adding nitrogen and cause an overabundance and possible toxcity in the soil. Definetly flush good if you had not.
Next tiger bloom should have more than enougn N for flowering. Your earlie ph loick out that yopu stated you fixed was why you had early yelowing. Now your at the poiunt where your sativa dom was arleady going to start her yellowing. This is the issue you made with the ph lock out. If the pics are old post new pics than but from your pics I see tons of young green inner growth as well as green secondary fan leaves. And your bud leaves look great.
Look at it this way, They are your plants, and if you go ahead and try to fix there is a good chance you can burn them. Thats why i posted that guide . WW is a 8-10 week strain. Your at week4 or 5. Thats midflower.
From the guide
http://www.icmag.com/ic/showthread.php?t=11688
Nitrogen (N) Mobile Element and Macro Element
Benefit: Nitrogen plays a very big role in your plants; this one element is directly responsible for production of chlorophyll, photosynthesis, Amino Acids, which are the building block of Proteins. The myriad of enzymes which help the plants growth in leaves stems and the how well the vigor of your plants is.
Nitrogen is the biggest mobile element meaning it can travel anywhere on the plant.
Usually the def will start on the lower to middle part of the plant, and then will usually happen to older leaves first. Then the deficiency will work its way up the plant. Your plant can be green on top, then yellowing on the lower leaves when the deficiency is starting out. Yield will be greatly reduced without good amounts of nitrogen in your plants. Sometimes in bad cases the leaves will turn a purplish color along with the yellowing.
Unlike a magnesium deficiency, nitrogen def will start from the tips and work its way back to the leaf node. Nitrogen and Magnesium get confused. The best way to tell them apart is, nitrogen deficiency starts around the tips and works its way to the back of the leaves, where a magnesium deficiency will cover the entire outer part of the leave and make the entire leaves yellow leaving the veins to stay green. If your plants are having a slow growth rate and have yellowing of the leaves, then most likely its a nitrogen deficiency.
Towards the middle to end of flowering stages, the plant will show a nitrogen deficiency almost always. This process is completely normal and just let the plant naturally yellow out as it uses it's stored nutrients. This actually helps you by getting ready for final flushing and then harvesting. At this point DO NOT not use nitrogen to fix the problem. The yellowing leaves will then eventually drop off after the plant is done with them.
I would hate to see you back here in the problem section with plants, that right now imho look healthy overall , with nute burn. Fix the ph, it casue the lock out. keep up the tiger bloom and ff schedule. Any addirtional yellowing is more than likley due to flowering.
This is what I would do in your situation. And I have shown You my flower tent as proof that I practice what I preach.
Good luck. Hope they end up dank as hell