I am a 4a. I have some hair that is curly.....some is wavy. The hair at the back is soft and fine....in the middle it's THICK and wavy....the front is wiry and hardest to work with.
I was natural for three years when I decided to texturize in order to curb my trichotillomania (my natural hair texture + frequent wash'n'gos = fairy knots/ssk which makes my pulling worse). And while it did curb the pulling until it began to grow out....it destroyed my curl pattern. When I put heat on it one time about 8 months after.....what little texture I had left on the ends was completely and permanently gone.
I stopped relaxing because after I had my daughter, my hair seemed to change and relaxing my hair left it with a mushy, almost dissolved texture. And now my texturized ends are more tangly then the unprocessed new growth.....and thin. I can't part with the length yet since I've only been transitioning for a year. In that time I have cut about 4-5 inches off. So I am roughly at the length I was pre-texturizer. I have spent the better part of the last year in yarn braids, yarn twists, crochet braids and wigs to avoid dealing with the two different textures. I certainly can't say this is a success story....but considering what you are looking for, it may help.