Power to weight probably has something to do with it too...

And... Air force rules aren't necessrilly the rules of aerodynamics and aerobatics. Lots of things aren't good ideas without a lot of practice and knowing the responses you'll get from the aircraft.

Taking a hint from Bob Hoover's biography... practice every manuver at altitude, with plenty of recovery room until you know how to do it perfectly every time. THEN you can try the maneuver (if the airplane is capable of it...) when low. Else... you break things. (and with models, you'll still break things occasionally when pushing the plane's limits...)

It'll be a few more flights with my new plane before I'm doing take-off rolls with it.