you're right, the pain does go away
With my first sust shots I had couldn't even walk up stairs! Same thing with prop, which was a shorter lasting, but more intense pain... I began diluting with Deca whcih worker, but have now discovered it's painless with or without the Deca.
Hell just yesterday I injected sust250/prop mixed and if i didn't have the bandage on, wouldn't know which glute i used!