Her pH had been dropping for 2 weeks, research said it was probably too much nutes, but her ppm's were good. So I started flushing her with water before each feed, and it seems to have gotten the pH under control while keeping the ppm's in range.
Continuing the "ponytail" technique for a few hours every day ~ I over defoliated another plant and I'm a little gun shy now. This technique really works for me.