Perhaps Im looking for too much!

I dont need my planes to fly VERY quickly, but I do expect them to knike edge and do decent size loops, with the ability to 3d.

With the 16/8 I can barely knife edge with full rudder deflection on the 300xs, verticle is good but not unlimited. I guess Im wondering if the 16/8 is enough of a "load" for this motor?

Im sure I can get stellar vertical with a 17/6 (20+ pounds calculated thrust) , but Im sure my ability to knife edge will further deteriorate, and forget about lar ge loops...Perhaps Im asking too much of a saito 180?