Quote Originally Posted by Dragavon View Post
Only things that was a bonus to base XP of a quest increase reaper XP.

That is ransack, conquest and ingenious bonus. Nothing else ever increased reaper XP as far as I know.
That is my experience as well.

Sometimes, though, doing an optional will toggle the display of the daily bonus back on, and therefore seem to add rxp. It doesn't alter the rxpp (or normal xp) actually added at completion, of course.