On another direction, it sounds like you consistently need shorter headpins. I have made my own, at home, before I had my studio, on my gas stove. On one jet, I had a small ramekin of household white vinegar, gently warming, for pickle. On another jet, I used heatproof tweezers to lower the wire into the flame. After it balls up, it is dropped into the pickle. You can cut the right length wires, from a roll of wire, or wire sold by the meter, so less wastage.
You could also make hammered end, or 'roller squashed end' headpins, the 2.5cm ones would be long enough for a small pearl, and a loop, rather than wire wrapping.