Two Weeks Into Flowering

So these plants are about 11 days into flowering and were a nice healthy green under the MH light. Now I am seeing multiple symptoms across all of the plants. All are a light green/yellow-green, but some have drooping leave tips while others have up-turned leave tips. The leaves all seem a little dry to the touch, and a few are starting to deform (twisting and discoloration patches). I have done my best to fill out the troubleshooting form and attached some pictures for reference. Please help me get these girls back on track!

What is your experience level? Novice

Your Equipment:
.1) Type and wattage of lights. 400W HPS
.2) Distance from tops? 9-15" depending on plant height. Just moved the light up about 4-5" today as I thought maybe it was too close. Didn't burn my hand with it at the highest canopy point, but figure I might as well give it a shot.
.3) Reflector type? Bat Wing
.4) Is there a consistent fresh air supply? Yes
.5) Do you have an exhaust fan and a circulation fan? Just a circulation fan
.6) What are the bulb wattages, kelvin ratings, and schedule? 400W, unknown ,10 on/14 dark

Your medium:
.7) Specific brand and type of soil, and anything you've added to it. Pro Mix with left over peat moss/generic potting soil root ball from previous container
.8) Size of container. 2gal plastic with water tray
.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
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...) None
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...) None
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. FoxFarm Big Bloom, LiquidKarma, PureBlend (also added a dose of ForaBloom last night as I thought there was a nitrogen or magnesium deficiency. so far this has not helped. dosed them just before they went to sleep last night and they have been "up" for almost two hours now with no noticeable results/not really sure what turn around time would be for a deficiency) Recommended doses on each. Only had one dose of these since moving to flowering 11 days ago.
14) How often are you watering between feedings, and how much per watering? Once every two to three days 1 and 1/2 cups every time.
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...) None
16) Are your ph levels stable, or do they fluctuate? Stable
17) What is your ingoing water's ph? ...your runoff ph? Not tested
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? N/A

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? 4'x5'
21) What are the temps and humidity levels while lights are on? ...With lights off? 74-76F 50-60% during day. Haven't checked night, but will have a reading tomorrow morning for night-time conditions. These are in a basement so maybe they're getting too cold at night?
22) Have you seen signs of insects in the growroom? No

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?) Random bag
24) From seeds or clones? Seed
25) Is this an autoflower strain? Doubtful, but unknown

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pH is really important.... If your pH is off, nutrient uptake is affected....and then plants will show signs of possible deficiencies....like yours are....

I'd say give em a good flush to rule out over fert, then get yourself a pH meter with pH up & pH down....

CGI::::::

I had the same problem a while back, and got it fixed thanks to CGI : ]

Anyways, make sure your ph is good and then maybe think about repotting if you havent in a while. I'm on week 2 of flowering in 2 gal pots and am about to put in 5 gal bags because I have roots coming out the bottom.