If you're still looking for a VERY moisturizing DC, try the caramel treatment or molasses
treatment as it's sometimes called. If you do a search you should find the list of ingredients which are a knock off to a name brand DC. I think the ingredients also mirror that of DivaSmooth (?) or some natural "relaxer" that is heavily advertised on the banners.
I did it overnight and found that it over moisturized my fine hair. But if you're looking for something heavy duty, I would suggest trying it before a flat iron.
I did it before I went to Aveda for color, the stylist did not know how to do natural hair so I left with it wet. I got to my friend's house and all she had was a Remington flat iron and some biosilk, so I ended up straightening. My friend (she's Dominican) said she was suprised how little time it took for me to flat iron and that it only took one pass on 360 degrees. (I'm 4a, she's a 3c textlaxed.)