I thruly believe by looking the plane that a good .91 4 stroke will be more than enough.
I like on my 3D birds to be able to use all the potential of the engine. Plane hovering at 25% throttle is not a good idea in my opinion. Big engines mean more wingload, more vibrations, more stress on the structure.....
Plane hovering at 60% throttle is good to me and because it will be light, it will exit the hover very good......
I already instaled a SMALLER engine on some of my planes....