What is your experience level? beginner

Your Equipment:
.1) Type and wattage of lights. CFL's: 4x27W, 1x42W - Tube Flourescents: 2x32W (4ft)
.2) Distance from tops? CFLS are surrounding the plants, all within 1-2" of leaves/tops. Tube Flourescents are about 6 inches above all the plants.
.3) Reflector type? Flat White Standard Shoplight reflector on the tube flourecents, Space Blankets for reflectivity on the CFL's.
.4) Is there a consistent fresh air supply? It is in a box with an open top, in a large closet (5x10) with no door. So yes I believe there is fresh air.
.5) Do you have an exhaust fan and a circulation fan? Yes
.6) What are the bulb wattages, kelvin ratings, and schedule? CFL's: 4x27W (2700k), 1x42W (2700k)- Tube Flourescents: 2x32W (6500k) --- All light are on 12/12 light cycle

Your medium:
.7) Specific brand and type of soil, and anything you've added to it. Miracle Gro Potting mix cut with Scott's Premium potting soil and about 25% MG perlite
.8) Size of container. 10 liter (approximately 2.8 gallons)
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? No, I used the plastic bag method of germination, and simply planted them.

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting? Tap water, approx. 7.0 ph
11) Method of checking water ph. Test strips (not the best I know)
12) Method of adjusting water ph. No Ph adjustment used
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. Shultz Liquid Plant Food (10-15-10) and Miracle Gro All purpose plant food (not sure of NPK) Feeding every other watering (about 6 days) with a 25% strength solution of EACH brand (making a 50% strength solution)
14) How often are you watering between feedings, and how much per watering? watering once in between feedings, watering until run off starts (approximately half gallon per plant)
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...) No additives
16) Are your ph levels stable, or do they fluctuate? Fluctuate slightly when feeding
17) What is your ingoing water's ph?7.0 ...your runoff ph? about 6.5
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? No, only water feed

Your growroom:
19) Indoors or outdoors Indoors
20) What size of closet, room or hut? 5'x10' closet, in a 2'x4' box
21) What are the temps and humidity levels while lights are on? ...With lights off? Lights on: 75*F Low humidity - Lights off: 70-72*F Low humidity
22) Have you seen signs of insects in the growroom? No insect whatsoever.

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

I was hoping I wouldnt have to do this again haha. oh well.
So what's the deal with the curling? I added a few pictures- note that the outer/larger fan leaves are fine. Thanks in advance everyone!