[Chaos]

I, with a level 60 character, am leveling a Youkai from 1 to as far as I can get, starting with Kinu 1 battles from the Statue of Memories. This is what the current method provides to my youkai's experience bar, with absolutely no points in the Summoning Talent:

Drowned Woman gained 700 EXP.
Drowned Woman grew to Level 11!

Then I decide to put three points into the Summoning Talent. I place five points into the Tutor subtalent, maxing it out, and one into the Friendship subtalent just to not have anything left over.

....And then I go beat up Kinu 1 again, only to see this come out of the fights:

Drowned Woman gained 1390 EXP.
Drowned Woman grew to Level 12!

Drowned Woman gained 1390 EXP.
Drowned Woman grew to Level 13!

I'm not exactly a math teacher, but I'm pretty sure +30% EXP does not translate to just short of +100% EXP.

P.S. My Affinity: Night skill is maxed out, as well. My current class setup is Grand Summoner/Evoker.