Your pH is fine... clones in hydro are happy with the pH sitting between 5.5 and 6.3.... As for your leaves, they honestly look like they were smashed somehow... like the cell structure has been "mooshed" ... I've reached out to a friend who is NOT on this site but who has extensive experience with hydro to see what he thinks about it... If he gets back to me before the problem has been resolved, I'll let you know what he says....
Good luck...