I like Dan's idea for racking the horizontal stabs. Here's another option which I used for all tail feathers. They have just enough weight that they remain fairly still even with the air pressure of your gun. And you have a clear shot at all edges and surfaces.
All I did was attach a couple 2 x 4's at ceiling height to the uprights of my paint booth and that gave me plenty of room to hang these and other parts. Wife thought my paint booth looked like a meat locker.
Tail Feathers.jpg