hey PDT
are the leaves limp, or are they droopng but still stiff?if they are stiff, try shortening your on time and lengthening the off time.
and if they are limp lengthen the on time and shorten off time

Depending upon root mass size,I have to change feed the schedule,to deal with usually "droop" . as the roots get larger they hold more water longer.
so they need longer off times

stay with it though,once you get things dialed in,you'll never go back to soil

I am no expert by any stretch,but have been using aero for almost 3 years in one system or another, started with 3"ABS pipes and wound up with 5 gal grow buckets on a central 40 gal rez

one thing for sure every strain I have grown liked something just a little different than all the others,which doesn't help when your trying to fine tune your system.

hope some of this babble helps
Daddy