The method i use is to add weight "if needed" to get the plane to the manufacturers recommend cg.... Then fly ....... Then either add or take away lead to get the plane to fly the way I like to fly !!!!!!! Once i'm satisfied it goes back to the shop and i measure the current cg and i try to move what i can to take away all or as much lead as i can. My point here is that I am flying the plane.... Not the designer. and yes i frequently go outside the manufacturers cg range. Light planes go vertical faster !!!!!!!!!!!!