I have the Goldberg Cub with an inverted Saito 72 as well. It flys it wonderfully. I am going to use floats on it this summer (couldn't resist the idea of a Navy Cub on floats

). Perhaps I will go with a Saito 91 for that flying. A few pictures and a short video of a landing with landing and nav lights on.
www.youtube.com/watch?v=EFqkHNH2Zm4