Netgear nighthawk r8000

i want to lower the bufferbloat as i have 700 and i still get allot of buffer and i want to get good speed as normal with this modem i get 700 from comcast i care more about wire connection as wifi will i lose speed and the other modem 980 3.1 adapter for comcast new services fiber gigabit speed

Did you install SQM?

But it seems that it will considerably lower your speed: