I want to add that 75% of all turbulent air problems are due to the wrong cg position for the setup of the wing. The other 25% is due to misalignment of surfaces, or wings, and stabs being warped causing trims to be slightly off. this little bit of trim misalignment can make you chase your tail and also cause small mixes in knife edge and inverted flight.

CG is the absolute most important thing on any design, it is not flexible and you cannot add anything to the airplane to fool it or help it.
It should be responsible for the whole platform of the design and the theory of the model layout. from wing platform , position and equipment layout.

The Shark Bipe is at 23%-25% depending if it`s glow or electric. 25% electric. The Bipes in general cannot accept a rearward cg it will not tolerate it one bit.

Bryan