When I started CG, my canopy was barely waving and my back was very curly. As I got the moisture/protein balance better, my canopy started curling, too. My canopy is also the first part to start to lose curl when my hair needs more moisture or protein. The canopy is more exposed to the elements and even if we don't use heat or damaging chemicals, sun, smog, and other atmospheric conditions can cause damage and curl loss in the canopy.
Experimenting with too many products to name here. All this great info keeps my head spinning.