Hey, Bobbie! You're on to something here. I think that what is happening with me is that the front and crown is also a different hair type than in the back. In the front, I have mostly wavy and even some straightness, but I think that's because my hair is much thinner in the front and the crown...well, not thinner, just more fine. The back is perhaps more of a 4a than the rest, which is a combination of 3b, 3c and SOME 4a. It's really weird, but I think that because the back is the stronger section, it grows more. I also noticed that by taking the MSM, the back is getting softer as well...