Now that your pH is in range, the old damaged leaves won't heal, but the healthy new growth is what you want to look at.
You are also almost ready for a new pot. Once the plant becomes too large for its container, soil chemistry is harder to control, and the leaves will show funky droop even if they are properly watered.
What I would do is next time the soil is nice and dry, give the plants a good flush with water at pH 7.0 to bring it right to the top edge of the acceptable range (6.8), and then water with a 1/2 strength grow fertilizer that is adjusted to pH 6.8 and has a drop of superthrive or thrivealive in it if you have those available. This will 'clean' out the the old soil that may have some salt buildup. It's easier to do this BEFORE you transplant.
Then, put the plant back and let it do its thin g until the soil becomes rather dry again. Now you can go ahead and put it in a larger pot. It's easier to transplant a pretty dry root ball than a soggy, loose one.