I really did try searching...

So, I don't know it this should be in the hydo section but, here we go.
4x8 tent (no light leaks)
5 lec 315's 18ish inches away
Flood and drain 12 min every 4 hours
1/2 & 1/2 clay and coco
Full line H&G by the book
Multi strain
78-70 degrees stable
55-65 rh (fluctuates with watering)
Constant air exchange, no co2)
65-69 degrees in the rest with an air stone and circ pump (no light leaks)

All through veg and the first 4 weeks of flower ph, temp and ppm were very constant and in check.
In the fifth week I started getting a .3 ph drop every 24 hours accompanied by a 100 pt rise in ppm. Ok, flush time right? 5.8 ph res swap. No nutes and 2 ml per gallon (115 res) cal mag for 24 hours. Ppm's rose and then evened out. Changes the rest and added 1/2 strength base nutes and shooting powder at 3/4 strength. Ph now dropping .1 - .2, closer to .1 every 24 hours and ppm up about 50.
Here's the kicker. The fruit is coming on well and 3/4 of the tent looks happy. The rest shows some nute burn from the previous rising trend but seems to be going no further. Am I being overly picky?
Flame on

i'm not really a hydro guy, but it seems like they're just drinking. they're using some of the nutes, but they're using more water, so the ppm goes up.
have a friend that uses dwc, he says if thats happening the chances are your nutes are a little too strong. try a slightly weaker solution, if the ph drops .1 and the ppm rise 50, try running 50 less ppm to start with... just a suggestion

I'll try straight water on my top up. Thank you