Is this normal for 3rd week of Flower?

Got this yellowing going on. Started at the bottom and worked up to middle leaves. I know during fflower fan leaves will yellow and die but this doesn't seem normal.

Monday is gonna be 3 weeks of 12/12. This is happening to 2 of my platinum bubbas and a lil on the pre98, while the SFV doesn't have any yellowing at all. They all receive same of everything.

I checked the run off yesterday and soil came out to be a lil high 7.0-7.1 So im thinking its definetly lockin out nutesto so I flushed and lowered the soil ph down to 6.6 on one of the platinum bubbas so I can see if that's the problem. I foliar fed a couple times with calmag and a bit of bloombastic (high P&K) Also started adding calmag since I did not do it during veg (I should have) since I use RO water. Soil is ocean forest.

For pics click on the link to my grow thread and scroll down to the very bottom of the page

https://www.rollitup.org/indoor-growing/452426-nugs-first-grow-5-different-10.html

Thanks guys...

Just looked at your Grow. Looks great to be honest. I would just cut to 1/2 strength nuts from what you were using.
Personally I would only cut back on one feeding then go back to normal cycle

Thanks man. So u think I overfed them? The last 2 times they only got plain RO water n calmag. I foliar fed them twice to make sure they got their P and K. So I think tonight ill give them half strength and next watering they will get full strength. I finally got a personal tds meter so now I can check the nutes everytime.

Ok so ran into another problem.

Somehow the temps got up 87 last night. Not sure how it happened because the hottest it ever gets its is like 83-84 during the 15 min of each hour when the exhaust is of.

So like 4-5to main tops got all messed up. Im pretty sure its heat stress but want u guys to confirm it for me since I've never dealt with heat stress before (im used to running air cooled hoods).

Also a few of the leaves got these dark purp spots. Not sure if its from the heat or from lockout. For some reason my soil ph runoff jumped upto 9.5. Really weird cuz I checked a few days ago and it was 6.8. So I went ahead and flushed the shit outa them.

So let me know what u guys think!

Will the heat stress affect my yeild real bad? Im guessing those leaves wont make it right?

Sorry for big pics. Will resize when I get home

Anybody...........?

Soil isn't my specialty but..... A calcium magnesium supplement and some sulfur might help. What are you night temps?

Note that after the problem is fixed that leaves will not return to normal.

ok, so yellowing from the bottom upwards is classic nitrogen deficiency, its common during flowering because most 'bloom' nutrients and fertilizers dont contain much N cuz its mainly for veggie growth.
the temp was kinda high, but shouldnt do too much damage foliar feeding takes the temps down a lot.
those splotches to me appear to be a phosphorus deficiency, but could be potassium deficiency, maybe even manganese def.
id put my money on N and Phosphorus being low. use a well balanced fertilizer for a little and see what happens.

Thanks guys.

Ive been feeding them with plenty of nutes. The flower nutes I use have a good amount of N and I've been adding calmag also. So im sure im giving them enuff nutes but they are just getting locked out cuz phh was so high. So u think I should I foliar feed them to supplement what got locked out past few days? I usually don't llike to foliar feed this late into flower incase of mold.
I really have no idea how it got so hot in there. Definetly must have been when the exhaust was off. I think im gonna get a temp switch to prevent this.

Night temps are betweem 73-78. Daytime doesnt get over 84 and that's only the last few min of each hour when I have the exhaust fan off for 15 min. RH stays between 50-60.

So are the main tops that got burnt gonna be affected bud wise? I know the leaves will die off but will the buds keep growing?