I rotate Vertoglute and Delts for. my injections. VG I have no issues. I can perform theZ track method effectively sine I have 2 hands free, but for delta, I seem to always leak a bit of oil. I use 25 gauge 5/8 inch on my delts and 27 gauge 1 inch on my ventroglutes.
My carrier oil is grapeseed oil, which is has a higher viscosity.