I have been shooting Mast ED for a while now, and I only use 6 spots:
L Quad
R Quad
L Delt
R Delt
L Glute
R Glute
On my next cycle, I will be pinning ED again, and I would like have 8 total injection spots, and I would really like to not shoot Glutes (I hate it... The most uncomfortable position to shoot ever) so I wanted to get an idea of what other rotations ED injectors are using