Could it be possible that the landing rate of Serenade of Eva is absolutely undependant on MAtk and the level gap between player and monster, and raises only with levels of the skill?
I've currently got it working about 50/50 on deep red and deep blue mobs alike, with or without shots, with or without weapon on the blues (I didn't really want to take off my weapon while ambling around an A Grader area in Karmian).
Does anyone else have observations on this, and if no, would anyone like to help with tests?