Modiying Inbalanced server to Balanced Server

The title speaks it all, literally when i develop a server and i don't like the gameplay, gui, damage, drops and so on. I modify it one by one so its really a pain in the ass because it is so many file and almost all items, mobs, and armots, accessories are in need of edit to make the game from HIGH INBALANCED DAMAGE to a NORMAL DAMAGE / BALANCED SERVER. Now in this case maybe you guys have something to share regarding the modiying bulk files? like edit all in one click for easy life to balance the server or i just need to edit all over again and again one by one.