I'm not sure self buffs count. I think you have to engage a monster for it to work. I've been through BRD song skill ups and now enhancing with martial master in effect. Neither has been anything but slow. BRD went by 100 times faster as soon as I found a target monster to skill on. I suppose it might work with self buffing, you just can't tell the difference.

Enhancing 320+ is an utter nightmare. I haven't been trying and it got that high on it's own. I started trying the other day and it's like... holy shi...