Ok, so how is it going?
I'm still unsure if you are some sort of modified hempy or straight soil. But here is the lowdown on nutes.
Your plant will pick various nutrients at different PH levels. If you can achieve a swing between 5.8 -6.5 you are good. But you need to see which way (if at all) your PH swings. I.e. If your Ph is only going to swing up a bit, Ph'ing to 6.5 is too high. Because you are going to swing out of the range where the plant best uptakes nutrients. Mine swings down, so I'll ph to 6.5 a lot, because I know that's the highest its gonna get. It will gradually dip & I try to catch it at 5.8 (ideally) again.
You don't HAVE to do this, but if you can get your Ph to cover that swing between 5.8-6.5 your plants will absorb more nutes.
If you are just going to keep a constant PH, the 6.2 is good. If it's rock solid like that, I would lightly vary what you PH it to. Sometimes go to 5.8, sometimes 6.5..etc. But i wouldn't go direct from 5.8 to 6.5 It's not a HUGE difference, but I've seen autos do some really funky things, & I think some of it is from ph.
If you are in soil, test the ph of the runoff next time you water. Or get one of those garden testers & test the ph of the soil mix. Hopefully, if it's off, it's low, if so, you can just add some dolomite lime. Powder, not pellets, I've tried the pellets & wasn't a fan.
About the food, you need to think of it like this. Each time you overdo it, you stunt the plant. Your plants don't look terrible, but the pic is not great. It doesn't look like you stunted them. But if you are in flower now...& you stunt them NOW, you are losing flowering time with the plant, & the end product won't be as good.
If you are able to, reserve one of the plants to be the test plant. Try your food mix out on it before the others. That way if you burn a plant, you have only burned one. Also, on the nutes, in soil, with those size plants, you are probably only going to get to half the dose that is recommended on the bottle. I don't ever go by what's on the bottle. I start with 1/4 of that, work my way up to 1/2.
At 1/2, the plants were very happy. If I tried to push it, I could see the signs. So just keep it at 1/2. You are WAY better off, until you have a good handle on what you are doing, to feed them just enough that you don't see any bad signs. Because if you
really overdo it, sometimes, you will severely impact everything. I had an Atomic Bomb recently that was beautiful. But it was a free seed. Just before the harvest, I gave it a feeding...just to see what would happen. It was a tad hot for the plant at that stage.
The plant has no smell, taste, color. It did before. But you can "bleach" those aspects out of a plant by over feeding them. So unless you have a plant that you don't care about, to test on, you are better off going with "safe" than sorry.
I highly recommend keeping a test plant during all runs. It's going to save you a lot of pain & heartache.
I'd love to know how it's going though...
**Edit** I'm not a fan of Autos. I keep growing them because I get freebies so I just throw them in the veg tent, but I haven't come across any that were great.
You should also start doing this
https://www.thcfarmer.com/community/threads/main-line-topping-best-method.60224/
Keep the plants shorter, better yields. Autos I usually just let do their thing, you will only have time to top it once or twice. But photos, learn to lst & mainline.
Lst is what separates the men from the boys.