the xp has already been boosted, and it is good that there is a skill that is really hard to get, dung goes up to 120 and so its a good challenge in my opinion i think it should be left the same, the only difference is when we have double xp the dungeoneering gets boosted to x3 instead of x2 so i will suggest to jim about a double xp for 24 hours soon.
-Area