Newly transplanted clones wilting

As title says... Blue dream clones, transplanted from spray type cloner into rdwc sytem 6 days ago.
since transplant fan leaves started wilting under and has not gotten any better
my first thought was lack of oxygen in water but checked with portable do meter (7.54ppm)

this is my 2nd grow using rdwc

system specs as follows:

10- 10 gallon site system with 30 gallon res
water temp - 71 degrees
ppm (700 scale) - 150 using cultured solutions line of nutrients
ph - 6.4
orp- 350-370 mv
ambient temp - 74 degrees
relative humidity - 50%
lighting- maxsisun mf2000 hung at 16" above plant canopy, lux reading at 3500

is there something I'm missing?

Cold ?

Ph- is a bit high IMO. I've always tried for 5.9 what ph- did they come from?
I wouldn't really worry too much, your new growth looks good.

Night time temp ?

That is a high ph above 6.2 is iffy so they say

ph in the cloner was a bit excessive, 7.2 on the day of transplant im trying to feather it down to 5.8-6.2 over the course of the next 3 days.

night time temps hang around 67 degrees


Thank you all for replying