I don't have much to offer that hasn't been said already, but.
First, setting PG to be a ghost skill rather than a duelist skill is a very good start. Might promote more ghosts?
Second, an FP increase is definitely needed, even as a promoted class skill. It's too strong to not, honestly.
Third, while crits are very strong with PG, and common to boot, I think I would be fine with them with the fp increase. I'm neutral on that subject, though. Could go either way.
Fourth, my opinion on absolute death is that it should effect basic attacks and kensei skills only. If crits are removed from PG, I would be fine if AD effected it.
Finally, I like the idea of PG being changed to be a sword or axe skill. If it's for Ghosts, that is. Axes need more love for them, and this is a step in the right direction I believe.