right on trab. so what size pin are you using for the delts? i might give that a shot (pun intended)
I can't do over 1'' there (delts). 25ga hurtz lessN 23's. Less bleeding.
But, If you ever use Stanoz, it requires 23's minimum (or dilute it). Cant push it thru a 25 well.
All Depends how big, and how much bodyfat a person has. And the particular muscle.
Glutes I use 1" or 1 1/2''.
Sometimes I use insulin pins for 1/2cc shots. Pull the plunger and fill from the back.Works fine on very thin skin areas.
Even if you rehit glutes, move around. Medical/ nursing books @ 2nd hand book stores have good Pics.