I hunted in GFay & Crushbone as a level 5 Bear, for about an hour or so. No Adjustment.
Changed to a level 15 bear, hunted in Unrest. First kill got me to 2%. I am sure all the orcs I had previously killed helped, but I wanted to see how quick it would be.
Stayed there until 4%, probably about another hour.
Changed to a 40 bear, headed to the Overthere. 45 minutes or so later, I was at 6%.
It seems to me that: the higher level monster you choose to be, the higher level zone you will choose to fight in, the more XP you gain on the shroud, which makes sense, because of the following statement:
If you die, above 9th level, you receive a loss of your normal experience. The higher level you are, the more the XP loss will be, so the risk vs reward is kept "in-check."
I'm working on getting to Wolf Beast, albeit slowly. Someone on my server has already gotten to level 2 Orc.