Dennis C...I was gonna say you didn't have enough power...but then I read you have a 100 on the nose. That should do it. Now I gotta think you don't have enough elevator throw. That would hurt your flat spin and especially your waterfalls.

I have the Saito 82 on mine and it will waterfall over and over and over and over...well you get the idea. It will actually just flip on it's length and not drop in elevation. Easy to do. I'm sure if your flying 33% you are fully capable of doing good waterfalls so it has to be in your setup.

Keep looking...you'll find the problem because this plane will do it all.

Thanks
Barry