RE: balancing a full flying stab
C-ARF say nothing about ballancing the all flying stabs on the Rookie or the Eurofighter, they are very light though and don't cause any buzz on the servo's in neutral, in flight the aerodynamic loading would diminish the stab loading when trimmed correctly with the C of G set at the optimum point, this all changes if you have the C of G a long way back for 3D flight when you would be carrying some down trim on the stab wich increase's the loading accordingly in straight and level flight, but how long does a airframe designed for 3D fly straight and level? LOL
Mike