I did. .. 7 shouldn't be negatively affect the plants, i.e. drooping/wilting. That is borderline okay for soil. But flowering does prefer a little lower ph. It's been a 'long' time since I used EJ, maybe 1/2 strength feed, or a commercial ph down product for your plain water.
I'll check the thread gain
EJ is the best product available for mud imo, been ages since i've done a grow mind you.. I found that it buffers at 6.2- 6.4 so never used to use ph down alongside it. Good luck with everything JR