My texture is very similar to yours, and in order for me to get a sleek bun, I detangle and ponytail my hair while in the shower. After I step out, I apply a dollop of Fantasia IC over my hair, focusing on the edges. I smooth back with my hands, and undo the ponytail. While keeping a firm grip on my hair, I take my denman brush in one hand , smooth any tangles from my hair, and put my hair back into a ponytail.
To make a really elegant and protective bun, I made this tutorial:
http://public.fotki.com/kblc06/new-hair-year-3-jan/its-my-21st-birthda/004.html
I've also provided a rollerset tutorial:
http://public.fotki.com/kblc06/new-hair-year-2-jan/wet-rollerset-tutor/
Please let me know how this works for you