Try Sidlab Haircouture Haute 1 Smoothing Shampoo, Haute 2 Smoothing Conditioner, Haute 3 Smoothing Gel. It is paraphen and sulfate free. It gives my 4 a/b APL natural hair a very smooth finish that lasts about a week when I use with my Babyliss Pro Nana Titanium flatiron. It is the best iron I have used with one pass and no pulls. Better than my Chi. Hope this helps. The website is www.siblabhair.com
Your hair is gorgeous. On the rare occasions I straighten my hair, I tie it down with a satin or silk scarf before showering and before going to bed. Cross wrapping my hair also helps to maintain the press as well.