As far as control throws I would just eyeball it at first staying towards the conservative side then increase from there. I tried setting up a plane that was given to me with large throws thinking, "hey I can handle it" Wow was it a squirel, I was lucky to get it down. Lesson learned, start with small throws and move up. Now that they plane is trimmed out I have the throws back up to max and it is a lot of fun. I also think a 40 size engine would be more than plenty for that plane.