Leaf Curling - Troubleshoot Included

What is your experience level? (first timer, novice, experienced...)
-First Indoor grow, Have experience in outdoor growing

Your Equipment:
.1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's)
- 90W CRee LED UFO with updated wavelengths, 120W incandescent agro-lite

.2) Distance from tops?
~ 2 Ft

.3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...)
Incandescent is bare w/ metal reflector

.4) Is there a consistent fresh air supply?
In a huge closet with half the door shut with an open widow next to it with a window fan running

.5) Do you have an exhaust fan and a circulation fan?
Just Circulation

.6) What are the bulb wattages, kelvin ratings, and schedule?
Was 20/4 with both lights just switched to 18/6

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...)
Local made compost potting soil

.8) Size of container.
4 gallon pots
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings?
No

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting?
Tap comes out slightly Basic

11) Method of checking water ph. (ph pen, test strips, aquarium test kit...)
Liquid ph tester

12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)
Ph up and down by GH

13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
GH Vegetative growth mix

14) How often are you watering between feedings, and how much per watering?
Frequently half liter per plant every 2-3 days

15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)
No
16) Are your ph levels stable, or do they fluctuate?
Hydro plants have stable ph of 5.5-6
17) What is your ingoing water's ph? ...your runoff ph?
Runoff NOT testable (need pen), ingoing is 5.5-6.5

18) Do you foliar feed? If so, with what, how often, and at what time do you spray?
No

Your growroom:
19) Indoors or outdoors?
Indoor
20) What size of closet, room or hut?
3.5'x7'x5.5'
21) What are the temps and humidity levels while lights are on? ...With lights off?
82F 60% humidity, off 75F 40% humidity

22) Have you seen signs of insects in the growroom?
No

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?)
No clue
24) From seeds or clones?
Bag Seeds
25) Is this an autoflower strain?
No

So on 3 of the 8 plants the leaves seem to be curling and buckling almost like they are drying out but i KNOW they are NOT dehydrated...hydro plants in same grow room are thriving as well as the rest of the soil plants