In the past i have used very bad quality gear and got lumps 2 years on my glutes , imagine the pain? Even Testoviron Bayer hurts for 2 to 3 days and got it from pharmacy. Pain is normal but when this happens every shoot probably your body is inflamed and anything you shoot even top pharma grade Bayer will do the same .
I have this problem and some of my athletes also. I put them on antibiotic amoxiciline and then they can shoot every day no problem .

When you have a huge inflamation on your body from gear , food, disease or anything else your body is completely inflamed and thats why your shoots hurt like that.