Ok then. Nice complete replies!
#1: pH is perfect
#2: Humidity is OK.
#3: The problem appears to be need for a Cal/Mag!
#4: If that's air temp, you may want to try and get that down a bit. Around 70F is prime. More air moving through the tent may help that! Fan on light may help too. If that's res temp you NEED to lower that to as close to 70F as you can get>
Run your nutes at the makers suggested amounts, add all of what your using together, include the new cal/mag supplement and the aqua. for 1 gallon of mix, Adjust the pH and shake it up and take a PPM reading. this is your "running" PPM ratio. you may need to adjust that down by as much as 30% till their older.
HINT: As the feed solution goes down, refill res. to your top off point with 30% solution of nutrient. (mix up a full strength gallon and add 2 more gallons of straight water to get your 30% solution). When you have reached the point of adding back the TOTAL amount of solution that the tank will hold , dump and refill with 100% solution! repeat.
When to flip? That depends on how tall you want to have your finished plant be.
You don't exactly know whats in your "tap" water. So adding in unfiltered tap water is not a solution to a Cal/Mag def.
In hydro any adjustment to an over/under feeding problem will take 3+ days to show the correction. N def. will show reversal of "yellowing" leaves starting at the top and going down as days go by. Any over feeding correction will only show in the new growth as healthy "green" new growth!
NICE looking plants!
Good luck and keep us up to date!