4 of my recent match. When XP booster applied. You are FORCED to fight against toughest enemy when available. And your team will very likely full of newbee, or poor players (lots of mid-quits).
Just see how well the opposite teams were.
As we all know, when XP booster applied matches. Players have to perform much better than his average to not waste the booster. So dev use this behavior to milk you to those veterans.
I even manually forced re-pairing the matchmaking by select "join both team“ and canceled it. (This allows you to refresh your matching process. And max waiting timer also restarted.