I move my Injection Sites around to give myself time to Heal, don't want a lot of Scar Tissue to build up.
Have you tried the Outer Quads.
Go 2/3 rds up from the Knee, and 1/2 way down from the Top of the Quad (rectus femoris) to the Indent where the Vastus Lateralis comes in.
That's my Favorite spot, and when done correctly, No Pain and Little Bleeding................................. JP