Yellowing leaves in flower

Yes, I know this is a total "noob" question/topic- but even after five grows I still have lots to learn.

The real question in- do my plants look ok at this stage?
Indoor grow, day24F.
Afghan Kush (Seedsman), Fox Farms Ocean Forrest with 33% perlite
Watered with aged rainwater only, currently every other day until runoff
Every watering gets 5mL calmag, 1mL Silicate, 30mL SledgeHammer per GAL
Every other water is a feed
FoxFarms trio, about 75% of the recommended dose. Prior grows were 50%
pH 6.2 to 6.8, varies I always have to add base to get it away from 5.5 after adding nutes
Environment is stable. I have a sealed room with A/C and CO2.
80F, 65%RH, 800PPM CO2
Airflow is good, I have two oscillating fans, one high one low
The A/C blows air all over the place, and I just turned on the carbon scrubber today
Lights are HLG QB288 X3 and QB96 X2
440W which provides about 700umoles at canopy, fairly even distibution
Last flush was before the flip, Day61V which was also day2 of 12/12
flush is with SledgeHammer 15gal per plant
I'm planning on flushing today, do I need to flush more than fifteen gallons?

So you're seeing it on watering day. The leaves are fading a bit, but I'm more concerned with the burnt edges and yellow/rust spots. Quite frankly I don't know whether I need to add MORE of something (either calcium or magnesium, and which one?) or I have a lockout issue. Once I added epsom salt, nothing seemed to change so I didn't repeat.
One interesting note- there are two plants here, the one on the RIGHT has always had those variegated leaves and odd leaf shape. Same everything, but that one was always different. One of the pictures (1455) shows a clear example, don't let that lead to mis-diagnosis.

I'm flushing today, as stated above. How should I proceed through the rest of the grow as far as nutrients are concerned?
What about the next grow? I'm considering changing nutrient lines away from the FoxFarm trio- but there are so many options I really don't know where to begin.


Thanks again for helping,
.Root in the right direction


Edited to correct SledgeHammer to 30mL/GAL, not 10 as originally stated

And can only attach 10, here's the other half.

If I missed something that you wrote down I apologize. Some people may disagree, but I would check your runoff PPMs-you can do a slurry test too if you want more accuracy-I'd just feed/water as you normally do and before you add enough so that it starts draining out, wait 20 min, and then add more food/water until you get enough runoff to test. Since you're feeding a lot in soil, it's worth checking to see if you've got crazy PPM buildup that is causing the beginnings of lockout. Some of your leaves look like early mag deficiency, but some of them have brown around the edges, which can mean K deficiency or lockout. Since you're feeding pretty heavily, you don't have K deficiency, so you might be looking at either a VERY low PH at the roots or just lockout in general. So when you test the runoff PPMs, check the PH too. Testing runoff isn't super accurate, but if something is WAY off, you'll be able to tell. It's very early, so if anything is wrong you have time to turn it around. Good luck!

You didn't miss it, I've never performed a PPM or pH test on runoff.
Unfortunately I don't have a PPM meter at the moment. I will get one coming.

After the first five gallon flush I got 6.0pH runoff.
The SledgeHammer 30mL/gal rainwater was 5.5pH, and I did not adjust it. The second I pH'd to 6.8. The rest of the flush I used rainwater only, 20GAL each. I forgot to check runoff at the end, oops.


Should I be dialing back the nutrients next feed or remain on course?

Just an update. Flushing helped a great deal. Just did another one a few days ago, albeit a smaller one. I pretty much kept on track with FoxFarms trio, about half the recommended dosage, sometimes up to three quarters. I think I'm doing ok. The buds are too heavy for the branches, mostly because VEG was mismanaged this run. Thoughts welcome.




.

I think R was right on. I think there is a mag def here and there was K def.

I'm on day 49F, due for a water today. Actually a day late they did not take up as much last water/feed so the soil was still wet yesterday.

Should I be adding Epsom Salts from here on out or is it too late? I know I need to stop feeding at some point but it's hard for me to judge. I think I've got at least two weeks left, you think I'm on track with that estimate?

You feed every other time in FFOF? I do 3 regular waters and then feed with FloraBloom 5ml /gal and some Recharge once in awhile and I'm green all the way til week 7ish when a fade occurs. I learned this method from Welcome To The Growtent on YouTube.

Yes, I feed every other water. However I'm open to using something else. I'll check out the YouTube channel.