Nice looking BBO Bow Coop. You are right it is the angle of the photo that make the limb look flat at that one spot but assure it is not. I think I recall from reading the Bowyers Bible it states not to draw the bow or over flex limbs till you skin backing on. This is the way I have been doing it now for three years and it has never given me any problems with it. yet I may be wrong but It works for me.
I got the the python skin in New Mexico when I Moved My daughter there to her duty station for the Air Force.