I might be wrong, but in past bonus xp days events, the % to scale was counted after all quest factors had been taken into account (like conquest, etc.), now the 20% applies only to the base xp????
1000 base xp quest
Total xp 1600: with 20% bonus xp days -> 1992 xp
Now it's 1800 xp (1000 base + 20% bonus days + rest idem).
Somehow disappointed at this cheap change.