Browning on Fan leaves a day after Changing DWC solution

Just switched to new, clean, 5.8pH 800 ppm temp adjusted buckets yesterday, and I'm seeing some brown discoloration on a couple of leaves of the LSD Kush plant.
Attachment 289608 I just trimmed the funky leaves. Any ideas? Plants look and feel healthy otherwise.

Here's the info:
What is your experience level? Novice.
What type of hydro set-up are you running? DWC Grodan clones with expanded clay medium to fill.
Your Equipment:
A) Type and wattage of lights. 270W LED
B) Distance from tops? 5"
C) Reflector type? N/A
D) What are the bulb wattages, kelvin ratings, and schedule? LED Chipset: 3W, Number of LED's: 80, Rated Hours: 50,000
Bands: 6 Band, Red: 630, 660nm, Blue: 425nm, Infrared: 730nm, Ultraviolet: 380nm, White: 12000k
E) Is there a consistent fresh air supply? Unsealed closet I open every day
F) Do you have an exhaust fan and a circulation fan? 2 fans 24/7
G) Size of reservoir? 5 gallon buckets
H) What medium if applicable. Grodan clones with expanded clay medium to fill

Your nutrients and water:
I) If using rockwoll for clones or seedlings, did you rinse the cubes well, with properly ph'd water? 5.5 pH soak
J) Source of water. (tap or filtered) What's it's ph? Tap dechorinated via airstones 7.0
K) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. Jungle Juice. Advanced Nutrients Jungle Juiceâ?¢ | If you've been using General Hydroponics Flora series fertilizers, read this NOW...
L) What is the ec/ppm of your unadjusted tap (or filtered) water? 50
M) What is the ec/ppm of your nutrient solution? Now 900
N) What is the temperature of your nutrient solution? (reservoir high and low temps) I dont have a guage for that, but my room doesn't have any heat issues.
O) Does your ec/ppm show a rise or fall when you do your daily PPM check? About 40-50 ppm/day in week 2 of flower
P) Does the ph fluctuate? Rises .2-.5 a day
Q) Do you foliar feed? If so, with what, how often, and at what time do you
spray? (Just after lights come on, just before they go out...) Whenever the leaves feel dry. I have a 50ppm JJ Grow spray. About once a week depending on stress.
R) How often do you replace reservoir water/nutes? What does it look like before changes? (clear, foamy, green, brown...) Every week. Last week had very foamy reservoir.

Your growroom:
S) What size of closet, room or hut? 2.5-8 Only have to plants on one side. Will get some another light and cut the room in half depending on the success of the new LED.
T) What are the temps and humidity levels while lights are on? ...With lights off? 68 with the lights on 60 off
U) Have you seen signs of insects in the growroom? Nope
V) Are the roots long and white, or brown and slimy? Long and white. Used to have more hairs though in the veg cycle. I switched nutes and had a power outage, it got foamy, and the cillia?(hairs) on the roots really receded. Don't know if to attribute that to the power or the nute change.

Your strain:
W) What strain are you growing? (Indica dominate or Sativa dom?) 1 Lemon Sour Diesel Kush and 1 Sour Maui Haze
X) From seeds or clones? Clones
Y) Is this an autoflower strain? no

Z) Prop 215 Compliant!

I think you're missing some nutes. Jungle Juice isn't just one bottle, but three that you're suppose to use together so plants get all the nutes they need. If you're using just one, like the grow for example, there is the micro bottle and bloom that are missing. Jungle is like General Hydro's three part fert method. In fact so much like it that the fert amounts are the same for a cheaper price as evidenced by this ad: Advanced Nutrients Jungle Juiceâ?¢ | If you've been using General Hydroponics Flora series fertilizers, read this NOW.... Advanced is saying "same thing, cheaper prices." You might need to get the other bottles if not using them already.

I'm using all 3 (Bloom, Micro and Grow) according to the directions on the label for the growth period.

Usually when people use foliar feeding, it doesn't go well. You shouldn't need to foliar at all, especially in DWC. Also, you might try not fighting the pH so much. In other words let it drift some, don't be so quick to get it down to 5.5. I'm not sure that 5.5 is optimal, some say it's the bottom of the range, but frankly the whole range could be 5.5 to 6.8. I'd ask about this is the hydro forum and do some research elsewhere and see what you find. Why did you switch nutes?