Not recovering from high pH?

[YoruKon3]

Greetings!
I'm encountering difficulty on my first grow. Perhaps I corrected too slowly and/or am imagining the worsening.
Yellowing, striping, & necrosis appear to be spreading, after recovering a high pH watering (~3 cycles ago).

Leaf stems have always been pink/red with mild tip burn & dark lush color (high nutes?)
Then, raised edges (which began canoeing & twisting). So, nute was cut completely out and watering reduced slightly.
The color corrected & deformity stopped. (tip burn & red stems continue. I assume the soil is a contributor.)

The downhill snowball started after using unverified water once or twice (turned out alkaline).
The first node began marbling yellow into saturated yellow deformity.
Mid / Top: Developing stripes, black-spot necrosis, & burned edges.
Deep spotting stopped quickly. The remaining edge burn, striping to yellow, and first node damage seem slowly continuous.
(burned tips continue since beginning.)

Hum. - 60-65%
Temp. - 72-78° F
pH - 6.5 (soil, current)
Soil - MG Nature's Care (Organic + 30% Verm)
(Unknown Indica-Dom?)

Experienced insight would be greatly appreciated!
Thanks for reading!
I have 4x res photos / can correct lighting if these are unhelpful.

 

[AngryBird]

I'm sorry, please upload a "sunlight photo"

 

[YoruKon3]

My lighting is still junk
I'll provide true sun pictures tomorrow but provide these in the meantime.

 

[YoruKon3]

It occurs to me I could be drowning them trying to flood the bad pH out.
I don't recall such prominent droop last watering.

 

[Weaselcracker]

Yeah the yellowing looks more like N deficiency. Chlorosis, possibly from from overwatering or from general starvation. Ph problems don’t generally cause that sort of even yellowing on lower growth in my experience.

 

[AngryBird]

I agree with Weaselcracker on this.
Sry for delay, but I have bad to no Internet at times

 

[YoruKon3]

Yeah the yellowing looks more like N deficiency...

Sry for delay...

I just bought an NPK test ...

No problem! Thank you. I didn't expect immediate, concise responses through forum.
I figured it best to get the info posted, in case it took a few days (granted the indistinct images).

I'll be waiting for solid daylight, anyhow.
Unless, the test results are irrefutable.
I assume this capsule/powder test is adequate?

This thing died within 72 hrs. of usage.

 

[Weaselcracker]

I don’t know... maybe best to google some reviews of that kit. I won’t be surprised to hear that it’s useless. Hopefully not though.

 

[YoruKon3]

Can someone tell me what shade of pink this is?
The kit gets generally good review & pH works, but the only videos I'm finding have very little to no nitrogen & assume it to be accurate based on soil choice...

 

[YoruKon3]

P came out very low / low.
K came out low / med.