A 7.0 pH in the soil wouldn’t in most cases be a big worry. But this certainly could be a contributor to your problem and adjusting the pH would not hurt.
Have you seen the “support ticket” checklist Latewood made? ILGM Grow Support Ticket
Check it out. Some other things that might be a contributor are your temperatures, day vs. night, and the temp at the canopy vs. the temp in the root zone might also be contributors, as far as anything off the top of my head, anyway, look through the ticket and may be answer all the things on the check list and maybe it’ll point us in the right direction.
~MacG