Jess, damage doesnt go away. It remains until it is removed. For now you can minimize the appearance with DTs and gentle treatment.
Also realize, that the longer split ends hang around the higher up the hairshaft they travel, thus resulting in a longer grow out period.
Only you can decide when and how much to cut, but you are on a good path with CG - hang in there - I had to grow out a permanent straightner - seemed like a lifetime, but now its AWWWWW-GONE!