I have the same kind of hair and it's due to not getting all the moisture out of each strand of hair when it's blown dry. I use a hot iron (professional grade iron cuts down the time spent on straightening) to make sure it is completely dry after I blow dry. However, a while back I got my hair permed straight. Sounds weird but I never had to blow dry my hair to have it lay flat and smooth. The product my hair dresser used is the product that African American women use to flatten their hair as apparently it is more gentle on the hair. I haven't done that in a while now though so I'm back to hot ironing. Good luck!