"You might be loading your blender incorrectly. Start with liquids and go from there. Add the solid components last. The motion created by the swirling liquids will suck the solid items down and keep the blades from simply tunneling through the middle of the solids."
https://www.amazon.com/Panef-Corp-Powdered-Graphite-Lubricant/dp/B0016GZQ60
Now I don't use hairpins but I would think the side WITHOUT the sharp pointed end would be better against your scalp?