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I see some white spots on the leaves. Make sure there are no insects under the leaves or in the soil.

I had a 4x4 tent in a hot humid walk up attic. The 30 pint struggled but the 70 pint handles it. I ran a 4" hose from the DH output into a tent port. So, the DH was working on the whole room plus injecting some low RH air into the tent.

A DH will take a lot of space in a 3x3. You could put a DH in the room the tent is in and work on reducing the RH of the air going into the tent. DH size depends on the size of the room you're tent is in. I started with a 30 pint but it ran constantly to keep the RH down. I got a 70 pint DH and...

Great plants and they look close. Another tip is those big colas may start leaning over from weight when they're about ready.

Looks like you could sleep in that pot!

I've tried both methods with photo periods (I haven't grown autos yet). I use rapid rooters and found that going straight to a 5 gal pot gave me slow growth and had to be real careful about watering. Rapid rooter to solo cup, then 5 gal fabric pot is my favorite method. Easy to water and the...

Gnatrol (BTI), yellow sticky cards, gnat nix, let them dry out between waterings and bottom feed them every other watering.

For coco, I prefer 5.7 to 6.2. I think 6.5 may work OK but it's a little high for Coco IMO. Did you rinse the coco to remove any excessive salts? also, you should feed Coco more frequently and it shouldn't be allowed to dry out between feeding.

How is your EC or PPM? Are you using Cal-mag?

Looks like what FF says. Try following the curled leaves' stems into the bud and peel the bud open to take a look.

Looks like it's stretching, usually means the light is too far away or not strong enough. You can transplant it and bury some of the stem to support it better. As far as nutrients, it depends on your medium. If you're using soil you probably have nutrients for a few weeks. If it's coco, you need...

That's a great light you have so there is potential but the light flowering footprint is 4x4, not 5x5. One option is try to hit 4+ zips per plant on 4 plants using what you have for lighting and space. That way you can see how close you are to getting big yields without making any major changes...

Frosty AF, nice plants.

Looks like mg deficient to me too, or it's locked out and not uptaking mg

Dollies, to move plants around a 4x4 for watering and training (tomato rings are cool too).

IMO, the first thing to confirm is your ph. Are you adjusting your ph after adding all nutrients and supplements? If your water is 6.5 before adding nutrients, it's probably quite low after adding all your nutes. You can buy a Blue Lab PH meter that will measure soil ph or liquid ph.

Yeah, my RO was around 8-10 ppm. I used 5 ml each of cal-mag, Canna coco a % b. I think that was about 400-450 so you're readings make sense. Not sure what's next. Like renfro says, make sure your medium isn't staying saturated.

Are you using RO water? That's really low ppm even with RO. If you have tap water plus nutrients I would think your ppm would be 350+ even at a low nute strength. Is your ppm meter accurate?

Is it possible the coco has a heavy salt content and wasn't rinsed? How's your runoff ppm?

You want most of the white hairs to turn brown/red and shrivel back into the buds. You will see the calyxes swell and the trichomes turn milky. I grew OG Kush photoperiods last year and they took 77 days from 12/12 light flip to chop. I'd restart feeding for a couple of weeks and go from there.