cool, now that's what we needed... so complicated when getting multiple advice... tough, i know... not to say you should trust me either as how would you know... ya kno?

The pics a little blurry... use a tripod, even if make-shift as will greatly improve stability in macros. Just an aside for the next batch...

I agree w the initial poster that pH lockout is the core issue. The way it is yellowing appears more like K vs N as it is also w some curl & stem/vein purpling. The spots, though out of focus, appear more like those that result from rapid and/or wild pH shifts vs necrosis from def. You mentioned high pH, which will prevent some of your micros from being available.

What is your ppm at mix? You're in soil? When did you start nuting vs plain water? How often are you watering/feeding? Need your run-off ppms & pH... very important on both in diagnosing.

My further guess is that the pH lockout is in part due to higher than normal ppm's within the medium. Some of the back leaves in the pics are hooked which is usually a sign of overdose on my part, though overwatering can have a similar effect.

See, there really isn't a simple answer & not being makes it really tough. Those pics sure do help though. Let me know. Best brah