Soil PH Runoff Low - Form Completed

I can't seem to get the PH right on the runoff... I flushed the crap out of them and the runoff is still 5.75%. They are growing but the first set of leaves is yellow and necrotic, the second set had crispy tips on the very end. New growth is great. Just concerned about the runoff PH. I planted them in rapid rooters on July 14th. To give an estimate of age.

What is your experience level? (first timer, novice, experienced...): Novice

Your Equipment:
.1) Type and wattage of lights: Custom dual blue 90W LED UFO, and three 6500k CFL's
.2) Distance from tops?: UFO=10 inches CFL= 3"
.3) Reflector type? UFO=Built in CFL=Open Bulb
.4) Is there a consistent fresh air supply? Yes
.5) Do you have an exhaust fan and a circulation fan? Yes
.6) What are the bulb wattages, kelvin ratings, and schedule? 90W UFO - 26W CFL's

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...): Fafard Professional Potting Mix
.8) Size of container: 1 gal nursery pots. Holes on the sides and bottom for drainage.
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? Rapid Rooter Plugs

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting? Tap Water - PH varies. 7.5-8.0
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...): Hanna PH Pen
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...): PH UP/PH Down
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. : Fox Farm Three Part - Big Bloom, Grow Big, Tiger Bloom. I am currently watering every three days or so. I add one drop of superthrive per gallon and one tablespoon molasses. No nutes.
14) How often are you watering between feedings, and how much per watering? 3-4 Days as the LED's and CFLs don't get that hot. Water until slight runoff.
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...) Superthrive 1 drop per gallon, Molasses 1 tbsp per gallon.
16) Are your ph levels stable, or do they fluctuate? Runoff consistently 5.75
17) What is your ingoing water's ph? 6.8 After adjusting ...your runoff ph? 5.75
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? I do not.

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? Secret Jardin 3'x3'x6' Grow Tent
21) What are the temps and humidity levels while lights are on? 79/40...With lights off? 77/40
22) Have you seen signs of insects in the growroom? No

Your strain:
23) What strain are you growing? Sativa if I had to guess.
24) From seeds or clones? Seeds
25) Is this an autoflower strain? Uncertain. Don't think so.