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RO water? What medium? What nutrient do you plan to use?

Ahh. Yeah, those things are basically useless. There are pricey soil pH pens, and cheaper soil pH test solutions that'll get you better results. Definitely use a water pH pen or solution kit when pHing your water. Good luck!

So is this just dust or something on the leaf?

Am I wrong or does your plant looks like it's still infested?

Just get back on track and since you have damage drop your nutrient back a little. pH your solution around 6.5 BTW, how are you checking soil pH?

Usually pH. I see some leaf color issues too, so I'd guess that. What's your medium, and what are you watering with and at what pH? Do you take runoff pH?

Toss a couple in a glass of warm water and keep an eye out. They might pop.

Yeah some plants have accessory pigments that hide the green, just like the green hides the yellow pigment. It still photosynthesizes. Regardless, just because a plant isn't photosynthesizing doesn't mean it isn't doing anything metabolically. Photosynthesis produces sugars and other chemicals...

My first instinct is to berate you but it's Friday and I'm learning to be a better person so... You're using a pesticide, and amended soil. You believe there is a deficiency. Without more information, I would guess that you're watering too frequently.

Just keep in mind that if you kill the mites, you now have dead mites on your buds, and you do NOT want to smoke them. I'm not sure of any ill health effects, but it will probably make you cough and want to vomit. I've smoked mites, it's no good, that's a one and done kind of situation. You...

I'd harvest, at least the buds that have all the dead leaves. Those are havens for mold and bugs. I wouldn't risk it.

Agree you've got ripening time left. Also agree, you have mites. Damage all over your leaves, and webbing at the bottom left hand of the second photo.

Yeah let it dry out more, looks like suffocation. The other plants are larger so they're drinking faster, and the larger plants may be getting better airflow being on the edges of the space.

It's too bad mites don't produce a psychoactive gas when burned. Sounds like a plan man, good luck.

Russet mites. There's even one specific to hemp. https://agfax.com/2019/08/07/kentucky-hemp-russet-mite-management/

Grow one plant low and slow. Low light, low nutrient, or slow draining. Basically treat it like a vegetative houseplant and take cuttings as needed. Just keep using that same plant as a clone donor, and you'll always have access to three fresh clones. Eventually, flower her out if you want...

Could be a number of leaf eaters. Japanese beetles, hoppers, caterpillars. You'd probably be able to see them with the bare eye, but they're REALLY good at hiding in foliage, if they're even sticking around anymore.

4 inch. No, I let the lower branches grow up into the screen and tuck them too. During stretch I'll remove some of the lower foliage that isn't getting light but that's about it.

I've never fimmed, but I top at about 8 inches tall, usually about the third to fifth node, and start tucking under the screen at that point. After that I tuck until the screen is about 70% full and switch to 12/12 and continue tucking until the end of stretch, usually about week 3 of flower...

The plant has been in flower for three weeks, or you switched to 12/12 three weeks ago? I don't start counting flowering time until the plant shows sex, which might take up to a week. I believe this is the standard most people use. TBH, that plant doesn't look three weeks into flower to me...