So we all know that the exp that you receive from last to first place is 200, 300, and 400 respectively. Sometimes I notice that I get more than the base, but cannot figure out why.

I got battle fever and got no additional XP. Took 6 nodes in one match and no additional XP. Second highest dmg and no additional XP.

Then yesterday comes, and I didn't do much since the two enemies fought each other most of the time, and managed to get 540 XP instead of the base 400. My buddy was in there too, queued using roulette so we didn't premake, and only got the base 400.

What gives?