Let me say that if you want the lowerst ping that you can get, is don't use any vpns and don't change the proxy and dns settings, if you are not then you got the lowerst ping that you can get with your internet connection
use wired connection.. if that doesnt help the only thing you can do is upgrade your speed of internet and last thing always pick a server of the game that is close to you.. don't play in NORTH America server if you are in ASIA or somthing.. it can cause huge ping