For hydro your PH should be 5.3 to 6.3. Try to get your rez down just alittle to 5.6 or so. It will climb just a bit most of the time.

what is the mix on the agressive growth schedule with GH 3 part ?

Runoff ? Are you runnign drip to waste ?

If the leaf does it much more it is canoeing. Can be a ph lockout.
Your close with ph anyway so maybe why only one plant now.