1st week flowering issues

Hello everybody not sure to freak out or to be calm about it, i dont know what to do and would appreciate all the advise i can get as it is my first grow and merry belated Christmas to all
ive read almost the whole forum on plant issues maybe iam freaking out i dont know, pretty sure ive done alot of mistakes

Info about my grow:

the 2 on left is acid dough, middle is lsd and the 2 on the right are outlaws

the 2 AD's are pretty droopy not sure where the issue is there and on the older leaves started getting yellow spots which i thought i mite have mites but checked all over and nothing
the lsd seems pretty fine
the top right outlaw started getting yellowing on the old fan leaves as u can see in the pic


pots: 6,5 gallon pots not filled all the way so i would say about 5gallons of soil
600 watt hps light in 4x4x6 tent
air circulation is pretty decent
temps: light on 25-26 C and lights off 17-20 C
humidity: light on 40 to 50 and lights off 58 to 68
Soil: biobizz all mix
Nutrients: Bio heaven, bio grow, bio bloom and top max and thinking to add acti vera
nutrients being used as per the table that came with it but at a little less than half strength not doing full strength
PH when watering usually between 6.3 to 6.7
watering 3L of water every 4 to 6 days to each pot depends on the soil when i stick my finger in to see if its wet gets some runoff, with nutrients at a little less than half strength

Watered just an hour ago 4L of plain ph water to each pot with no nutrients

Could be overwatering? 4 L seems a lot with the size, looks like the symptoms to me, even in late flower I only water 2L every 4 days, obvs strain dependant but that’s what it looks like to me. Are you in the UK? UK tap water has minimal cal and Mg which may explain the slight yellowing, you may need to add these with Epsom salt or a little cal mag, good luck bro.

I would also think overwatering. I use a little more than 4L in my #7 pots. Do you vent your tent always or just when the lights are on? Ive had that discoloration happen, when I overwatered in conjunction with a bad fan and my humidity was spiking in the dark hours. Swapped the fan, dialed in my waterings, removed the few damaged leaves and it was business as usuall. I feel like you should start lowering that humidity soon being you are in flower.

Yeah get that night time humidity in check bro!!!

Month old post brought back to life. OP you still out there?

One post wonder!

Your crinkle leaves say PH problems
Shoot for 5.8/6.2, when was the last time you calibrated your Ph pen?
Growing 3 different strains is at one time is more then most new growers should take on. Each will require a little different schedule, so if you mix up 1 feed some will benefit some will be ok some will suffer, or mix 3 different feeds.
You’re watering a bit to much, water by weight not date, (pick up the pot to see the weight) need to get the night time RH in check

Didn’t notice it was old