Moderation
Big 4-stroke? A .91 will fly the Senior just fine. I saw one do all the same stuff with a .52 4-stroke. (or was it an old .48, same difference...)
You could put a Saito 1.80 on it, I suppose, but why? Not really a platform for racing or aerobatics. It would sound neat, tho.
Good luck!
Dave Olson