I thought (still think) it was phosphorus deficiency

I will post some pics but first a description: This is bag seed, I'm 23 days into flower and hadn't been using nutes. I figure there are still several weeks until harvest so I think I'm loosing too many leaves to whatever this is. I think it looks most closely to phosphorus deficiency, so under this assumption I began using some FF Tiger Bloom 6 days ago a 1/3 dose and 1 day ago a 2/3 dose. I haven't seen any improvement and it occurred to me that I hadn't tested the run-off for a while so I did and found it at ph 6.1. So now I think it may still be phosphorus deficiency but caused by nute lock out.

So I need some advice I'd like to water with some ph 7.3 (maybe higher?) water in an effort to counter the 6.1. What I don't know is should I wait, because I watered yesterday or do immediately. I know what I think I should but I need to act with restraint so I don't cause a bigger problem. I thought I'd add, I would like to add some lime to the water to bring the ph up.

Pics:
(the clawing in the pics is old damage (different issue) and the new grow seems to not be clawing. Also after the last water with nute the leaves seem a little saggy)
(last note, the pics don't seem to reveal just how wide spread the issue is)

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PS
sorry for the long post just very concerned.

what you have is magnesium deficiency. looks like you have more than one fert problem but if what you're giving doesn't mg to it, try this: get some epsom salt at a drug store and put a teaspoon in a gallon of water and give that, not all of the water but some of it like half a pint to a pint. let the soil dry out. you're long into flower and there isn't much budding. it looks like the plant is pretty short and bushy, an indication that your light might be too low. don't worry about you're pH. don't flush with just straight water. don't put lime or anything else in water to raise the pH. don't over-think growing a plant. if you want a more complete fert, then get dynagrow there's only two to choose from. get the one that's right for the time cycle, either veg or flower. don't overfert a plant. don't fall for all the different products in a grow shop. study real plant science, not the stuff you read in internet forums. you don't have to get complex but there are some things to know. maybe write a fert company and ask what they suggest just don't tell them what you grow, but of course they already know that much, that's why you use their products. try a better soil if you want where you just add water, search for sunny girl soil on the web. comes with instructions shipped to your residence, easiest thing you could ever do.

Text. Hit this link. It'll take you directly to the plant problem FAQ section of this forum. Pics and Info all there.

Magnesium
Chlorophyll has the same structure as Hemoglobin, except that it has a magnesium atom in place of the Iron atom. Chlorophyll is how plants make sugars to feed the process of building ATP through the Krebs cycle.

Magnesium deficiency

A magnesium deficient plant is identified by intervenial chlorosis, necrosis, and eventually a lockout of plant nutrients. The problems starts at the bottom of the plants and works it?s way up.

Magnesium deficiency

These images depict different stages and signs of a magnesium deficiency. The first picture is a Mg deficient plant in flower, and the second two are of the leaves to show what I mean by Intervenial Chlorosis.

Magnesium deficiency

Treating with an Epsom salts mix will clear this right up.