Cannon damage change Arma III

Hello comrades I would like to change the damage of some cannon/turret. Fo example I would like to make the Spearhed 1944 Pak-40 stronger against 2035 era vehicles/armors, and the S.O.G. cannons weaker against 2035 era vehicles. How can I change the damage of the ammunitions? Can I chane some value of numbers somewhere or I have to make it more difficultly? Can I make a mod for it to my self about the changes which I can disable in mod manager if I would like to use them without changes?