Coop always have terrible rubber-banding?

So, I have 100Mb fiber internet here.

I started playing with 2 friends today and we have terrible lag, no matter who hosts the game.

It doens’t happen in any other games I play. Just BL2.

I can host Killing Floor 2 games for 6 people and get very low ping/latency with a very smooth experience for everyone.

How can I solve this problem?