Actually, Fighting Spirit Combination is that one skill that hits the target 2x but for less damage total than their other melee skills. It's pretty much worthless in the end, P/W doesn't need self healing skills so much as they need better weapon skills/accuracy/pcrit. But I too might go back to playing my P/W...
What they really need is so simple, just up their axe mastery to something reasonable. If FSC now heals self, well, the possibility to become unkillable (except for one hits) seems achievable. However, as i stated earlier, I do not actually know what they mean by "recover caster's HP" is it the lame fixed number heal like we get from Condensed Rage, or is it some percent of the damage produced?
This skill would have been awesome if it applied to Explosion of Fighting Spirit instead....