B.M.
Hi, mom!
It's been quite a number of years for me to have to deal with "hair", but if I remember correctly, instead of pulling back the hair, try gently brushing and pulling "forward". That way the stress on the hair is from the stronger area of the scalp. If you must tie or bind, make it a loose wrap of the tie, and allow the hair breathing space. I have two daughters, both African American. One had hair that was quite thick and unruly, the othe was more on a thinner side, such as my own. Both had very soft hair, that accepted every bit of "fuzz" blown their way. I did a lot of braiding in their youth, and I had the same problem of bumps and thinning, when I was heavy handed in the manipulation. I had to learn to not be so worried about how perfect it looked and more aware of their comfort. They are both in their thirties now, and my oldest is a mother of two, one is a girl who challenges the "hair ritual" daily (smile) Hope this helps
B.