HELP+ HELP+ Leaf Curl Downward, Possible Over water-Heat stress, Help me Please.....

Hi, Got a few plants that are seeming to be under the same stress, and a few are better of than the others,
Here is the Info, 5 weeks of Veg. Nut.'s are a bit high Cuz I used Tap water rather than my usual RO water
my filters need replacement, and Flow was so slow....

Tap water is 285 PPM, 7.6 PH out of tap,
took and reduced PH and added a few drops of Fish De-Chlor to the mix, water temp is 75 F.

Lights T5 maybe a bit too close, temps in room are 80's and Grow Tent are 83+ F, around 45 to 50% Humidity.

Seems all the upper growth are curling in and Down,
Mid Level is much less, and Bottom are not too Bad at all,
Watering every 4 Hours for 20 min, Ebb and Flow setup.

PPM of nutes are close to 1270.
I added me nutes based on the base water of 280 PPM, to add in around 1000 PPM
of Solution to me feed schedule, Did I do this wrong, Well it looks real bad, and I feel
I really missed something, I have lowered my solution PPM, and cut back on watering,
and lifted my lights up a bit 2-3" higher, the leaves feel dry, papery, and not soft and
pliable, growth is still coming, but very slow, Did a rinse with Flora- Kleen today, just
on the net Pots for 20 min each before adding them back in to the grow, and cut back
the light to 18-6 from 24 hours.

Seems like a big dumb move on my part, can anyone help and tell me more, or if I am
going in the right way ?

This one is not going the way I wanted it to, and Any POSITIVE help is welcomed....

Thanks

Found some interesting stuff here today, It may relate to my problem ?:
My roots are quite balled up in the net pots...

First the quick rules:

1. Young leaves curling; the humidity in your grow room is probably too high; open the door!
2. Old Leaves curling: something is probably wrong in the root zone. Often it could be a bit of root rot. You can minimize the risk of root rot by stopping the watering 2-4 hours before switching the light off. The stonewool should only be 50-60% wet over-night.
3. Sometimes your general humidity is just fine, but your plants are so bushy that there is not a good air movement between the branches. Use fans. As an example, I can see that my cherry tomatoes are most happy in 15 mph "fan-winds".

More technical detailed explanation to curling leaves
If the youngest leaves are curled downwards, it more than likely indicates a calcium deficiency. If old leaves are curled; something is probably wrong in the root zone (which also reduces the calcium uptake).
Calcium deficiency is the result of insufficient water movement through the plant. Remember, calcium only travels in the water stream of the plant, not in the nutrient stream. Therefore, calcium deficiency is usually (90% of the time) related to the climate in the growing area. High humidity will prevent calcium uptake even if there is sufficient Ca in the feed solution. Also, large day/night fluctuations in humidity will disrupt the Ca flow within the plant and lead to blossom-end rot (BER).
Another cause of BER or obvious Ca deficiency in the leaves is poor root development. This is a result of low substrate temperatures or the presence of a root pathogen such as Pythium or Phytophthora. Calcium is taken up by the area of the root immediately behind the root-tip. If the roots are not actively growing, new root tips will not be formed and consequently, Ca uptake will be reduced.

First of all, Thanks for all the Great feedback,
Solved this problem myself.

New pics?

interesting information about the roots and calcium, probably explains why rootbound plants show similar symptoms. also yeah pics

View attachment 2422247 3rd week into flowering The young leaves are starting to dry and curl humidity is around 46-54 temp is 73-77 the older leaves are healthy but young leaves are drying and starting to curl I had to repot a couple days ago due to root bound kept the same watering schedule until I noticed over watering so I giving her a ill break any clue to what the problem is