Areas with stretch marks from when I weighed two hundred kilos are much tougher to push through. I rotate between stomach, butt, and thigh so spots get a break. With these thin short needles the butt and thigh should not be much trouble.
New to this after twenty-five shots, the main problem is needing noticeable force to get the needle through the skin. Tried both straight in and angled approaches with no real change noticed. Using six millimeter thirty-one gauge syringes. Want to sort this before frequency increases. Maybe it just comes down to pushing faster or harder?