I dont really know whats right or wrong but I always start at the suggested C.G. for the madien flight. After that it gets shoved back some b/c I am a 3D freestyle type of guy When I go to fly IMAC I plan shift my pack to its proper place. In the sukhoi I am setting up now I hope to have it where I can slide the pack forward or aft depending on if its freestyle time or sequence time.