Have you tried eliminating the up-side down nature of your styling (if the tangling is occurring during the day?)? If you need volume, you can add it after the hair dries.

Also, if your hair has a lot of knots after sleeping on it, you might want to change your sleeping arrangements.

On another note, some products just give me horrid tangles and knots even though my hair looks good. (Your hair looks great, by the way).

For example, I used to leave a little TJ Balancing Moisture in my hair to preserve the clumps, but I got these disastrous tangles that would not disappear.
Hair Type: 3c/4a, Coarse, Med-High Density, Med-Low Porosity
Curly since '09