I had one of those Concorde 9/15's. Ran it 1 time and pulled it. Just did not work on my setup. Way to low. May be fine on non ported motor.
Im about to find out if I can make it work on a ported motor, if not I guess I will be in the market for a taller prop. It did however work really well on a non ported, piped, high comp 701 this summer. I am going through the motor quite a bit so I may slip the hell out of it for all I know.
How many degrees can you bend these props for tuning?