Folding Prop 15-16cm diameter?

I´m using the common Faux folding prop with 18cm diameter for my DIY foil drive with a 6384 motor and a 7500 ESC. Now i tried a fixed blade prop with 15cm diameter and it runs smoother, the current was less a the cavitation also. Is there a smaller folding prop STL available? Even the hub of the Faux prop broke at the base to he motor two times.

THX olli