i just wanted to say that my funtana has huge rudder and elevator...
i use 40 degrees of deflection on both....
have a os 61fx engine with 13x4 prop........
weights 6.1 lb ready to fly minus fuel (dry).....
have it at recomended aft CG location....

and it holds knife edge at 3/4 trotle and little more than 3/4 rudder.....

blender are tight and flat......

so if u want to do blender and more aerobatic stuff, u will need a lot of elevator and rudder movement and a aft CG...