What ISP are you paying at the moment?
To play online game, wired connection are preferred. More stable, But if you're using UNIFI, it should be not a problem. Because, Unifi Router is N version.
So, I believe you're using something else. Not unifi.

Your computer already enough to play the latest game. Which mean, there is no problem at all with your hardware.

My suggestion is :

1) Forward your port 9113-9114 (If I'm not mistaken)
2) Use wired connection.
3) If you still have the above problem, you should upgrade your internet speed.

P/S: You can try your computer performance using other people internet. Maybe your friend.