Asus advanced router setup

Hello. I just recently picked up a nighthawk CM3000 and a ROG GT-AXE 16000. I am looking for the best software and settings to get ultra low ping and stability. I can see 8 ping in game at times but it will go up to 15, back down to 12 etc. I want to keep steady 8 ping if possible. I have Xfinity cable 2000 down 300up. Any help is much appreciated thanks!