I use a gold headpin that is easier to bend than the craft-store variety. Would that be a gold-filled headpin? They cost $3.20 for 10, and now I'm not sure what to order.
At that price, it seems like you are using gold-filled headpins. The thinner the gauge, the more easily they can be bent. Finer, lighter weight diameters, are 24-gauge and 26-gauge. Heavier gauge headpins are 21-gauge and 22-gauge, should you find you need them.