Gotta find another site bud. Lumping is partially due to oil total volume and the concentration of the drugs but also due to scar tissue buildup in the sites. Rotate away from the shoulders for a while. Find the VG injection site, it's easy to reach if you lay on your back then throw one leg over the other and you can jab right down into it pretty easily, I can get in with a 3/4 pin and leaner folks can probably use a 1/2. There's one real, real good video out there where the guy shows how to locate it but it's private on YT so someone with the link is gonna have to post it as I don't think I have it. Essentially if you do a side leg raise you can activate the muscle and see it around the hip area, and you're just trying to find that same muscle while laying on your side. Once you have placed your hand on it and felt it contract a few times you should know exactly where to go, just gotta err toward the 'front' or 'back' sides of it because dead center may nail your IT band. This is the easiest site besides delts and is virtually painless.