Your pH is just fine... there's no problem in that regard. The feed chart for your pH Connoisseur nutes says to give them 4ml/l throughout the grow and you're only giving 1.59... I would take those nutes up a notch to at least 2.5 or 3ml/l. As far as the damaged leaves are concerned, they're never going to repair themselves so don't expect that - what you SHOULD expect, if you can correct the problem, is that no new leaves will show the same discoloration...
Good luck!