Hi Thanos, I used pretty much the same set-up as you. I use this motor with a GWS curved 8043 prop, a 10 amp esc and a 3s 460mAh rhino:
I used .047 carbon rods for pushrods. I get about 4 minutes of pure hover and the motor gets a little hot. I get up to 10 minutes of easy flying and the motor gets a little warm. So I don't know what to suggest. Maybe depron is much heavier than 9mm 1.3# EPP.
My AUW with the 3s 460mAh rhino is 8.34 oz. Best of luck!