I have a square bum! Please help me...

Pic: http://imgur.com/a/dH0sE

I am significantly lacking in upper glutes. My daily routine consists of hip thrusts, hip abduction, cable hip abduction, back extensions and squats. Do I need to lose excess body fat to attain a more round profile? What upper glute exercises do you recommend? Constructive criticism is welcome! Just a Gym rat looking for help :)