is this natural or should I be bummed

hey guys . I wanna thank you in advance for whatever help you offer me .
My plants are at the end of week 5 flower ; week 6 starting tmr. Throughout the entire grow thus far, the plants grew perfectly healthy . Never been burned / never been deficient . This is my third grow, but first to ever get complex and as precise as possible.
Here's the problem:
All 4 of my plants are starting to show some nasty looking probs on their leaves . To me , these look like calcium deficiency, magnesium prob maybe, and boron deficiency . I don't know what the little yellow specs along one of the plants' leaf veins could be either, but it's also showing the other one too with the boron looking crap. does magnesium tox sound right? As I said the plants are about to be in week 6 flower and these are first probs to show . I realize I'm starting to hit late flower , but this still just doesn't seem normal to me . Leaf tips appear slightly burned.
Essentially all of leaves that are affected are those on the canopy , and the bud leaves on the colas . I don't seem to see any of this below canopy / where light fails to hit . So to me that means there a chance this is natural lol .. But I just don't know
Specs :
Soil grown
Been feeding them same as always in flower .. Kelp, tiny dose of grow big (.5tsp/gal) , 2 tsp tiger bloom, 3 tsp big bloom, 1.5 tsp of a bud sweetener "Bembe" , 1/4 tsp beastie bloomz OR 1/4 cha Ching OR 1/8 of each of the beastie and cha Ching .
Solution ph , through entire grow, is between 5.8-6.4. I feed them every other watering.
400w hps and 2x 7-band 180w LED
Average temp is 78-80, humidity ranges from 45-55
Holy crap I just checked the highs and lows of my unit and said the high of humidity was 78% wtf ?!? I rly hope they don't get goddam mold !
Past few days temps have been like 81
Last night I gave them all a little calMg to see if it would help , don't see any diff . Am I paranoid , or am I fucking my plants up somehow ?

It's a Ca deficiency. Keep giving them calmag. Also, those tiny white patches could be the beginning of some powdery mildew from the pics. You've got to get that humidity down.

good luck
zo

Thanks guys
Weednerd-thank you for the chart. I've been over far too many pictures and to be honest most of the time when I have a plant problem, the charts only functioned as a means to null out the possibilities/find a similar case. But it's so difficult for me to find out why the problem is occurring ! Ph ? Lockout? Humidity ? Temp ? Disease? Etc. and the great part is that 9/10 times I have figured out any of my problems from simply making assumptions and treating it. But this is a more crucial part of the plants life so I'm hesitant to act on it.
Zobudd- thank you as well man ! I couldn't believe that humidity when I saw it , it's usually 50-54%. That high must have been right after I watered . When I enter the grow space i do get a scent of mildew . But I've been thinking that the smell is simply the skunky aroma from the plants . I have tons of "white patches" but to my knowledge they're just all trichomes surrounding the colas . I've never had powdery mildew but I'd think that a grower would be able to visually tell the difference ? Trichomes have a distinct look to them , ya know ? I will be feeding more calmag late tonight when I'm out of work
Thanks again

Hey guys , just an update . I gave them a dose of 1.5tsp/gal of CalMg+ by General organics with plain water (ph around 6.3) last night as their feeding.

Not so sure if I'm supposed to see results yet ; are the already affected leaves permanently damaged like that? I need to know so I cons find a different way to note progress.

ASLO: I just wanted to hear some others opinions of how my ladies look for just beginning week6 flower--are they behind or Ahead maybe? Size looking good? I think the ones in the last pic Look good for their age, they're the ones closest to light and they're really fatter than they look in pic , I just measured and they're 2.5inches in diameter ! At 6 weeks, do they still got more growing to do ??
Thanks all

itchyB said:

Hey guys , just an update . I gave them a dose of 1.5tsp/gal of CalMg+ by General organics with plain water (ph around 6.3) last night as their feeding.

Not so sure if I'm supposed to see results yet ; are the already affected leaves permanently damaged like that? I need to know so I cons find a different way to note progress.

ASLO: I just wanted to hear some others opinions of how my ladies look for just beginning week6 flower--are they behind or Ahead maybe? Size looking good? I think the ones in the last pic Look good for their age, they're the ones closest to light and they're really fatter than they look in pic , I just measured and they're 2.5inches in diameter ! At 6 weeks, do they still got more growing to do ??View attachment 3699749View attachment 3699750View attachment 3699751
Thanks all

Click to expand...

Unfortunately, damaged leaves don't recover back to their former selves. Just keep an eye out for signs on any new leaves. The spots should stop showing up by 2-3 days after the calmag.

itchyB said:

Hey guys , just a update . I gave them a dose of 1.5tsp/gal of CalMg+ by General organics with plain water (ph around 6.3) last night as their feeding.

Not so sure if I'm supposed to see results yet ; are the already affected leaves permanently damaged like that? I need to know so I cons find a different way to note progress.

ASLO: I just wanted to hear some others opinions of how my ladies look for just beginning week6 flower--are they behind or Ahead maybe? Size looking good? I think the ones in the last pic Look good for their age, they're the ones closest to light and they're really fatter than they look in pic , I just measured and they're 2.5inches in diameter ! At 6 weeks, do they still got more growing to do ??View attachment 3699749View attachment 3699750View attachment 3699751
Thanks all

Click to expand...

Yes they do have more growing to do. They will fill out the most In the last 2 weeks.

it is not a deficiency. back off to just water for the remainder of your grow. imo you have overfed your plants and are now seeing the end results.