I don´t use at all the inverted flight method to fine tune the c.g. settings. Thrust angles and settings can fool this method and you can end up doing a nice flat spin to the ground. (ask how I know it.. )

I usually check the pitch control authority at landing. If I can´t hold the plane´s nose up at touchdown while flying at the lowest possible landing speed the CG is too forward. On the other side If the airplane have full pitch control but it "wobbles" (specialy at windy days) too much at this same moment, the CG is too aft.

Of course, I always use the MAC method for finding the cg as a initial estimate, considering not only the wings, but strakes, fuselage,canards, or everything in the plane that could act as a lifting surface.



Enrique