Hi Bob!
I am flying my roo with different turbines. Normally it flies with a 95N turbine. We bought a PST J-600 and have not finished our small casa aviojet by now. But to test-fly the turbine

we put it on the roo and it flies great. Well, not too much power, but very comfortable.
AND: A week ago I talked to Markus Zipperer and Horst Lenerz. Horst flew the P-70 on his HotSpot and it flew extremely fast. Markus said that most of the P-70 have the same thrust as P-80. Go for it, it is a nice and reliable engine.
greetings from germany,
David