I do not fish the Royal much, prefer the humpy over it. But I believe that the combination of peacock and red make that fly. Wings are just an add on. But that is MY opinion. You might want to get the fish's opinion which is much more valuable.
The old Coachman standby. I got to tie some up!
I remember fishing a coastal Canada river estuary and a guy on a hot day in August during the evening hooked the largest salt-cutthroat I've ever seen. Using what? A basic california coachman; same pattern, just substitute yellow for red.