This is the case in fonline, xp grinding with high outdoors takes longer than with low outdoors because you encounter less.
That is only because it lowers the exp as you put more skillpoints into it.
Besides, in the end exp doesn't matter once you meet the max level, and exping by outdoorsman not an efficient way at all after about level 10.
So I would rather focus on the uses for it, rather than how to use it to exp...