i dont own this model, but i own a flip. i run 148s on all surfaces and even with 5mm of slop each way i can do 3D. You WILL notive a difference wen you go over 5kg. Some people say you need 8kg to 3D a small plane but i dont believe this. If you run the servos on 6v (like i do) the torque will rise and the speed will definatly increase.
All i can say is that yuo wont have the performance like you did with the 8411s.

BTW, is that your ferarie?