I haven't focused on crits and I have nothing to boost them. I wanted Ghost Touch to hit corporeal creatures when I manifest without a miss chance, not battle ethereal ones - I can do that anyway.

As for the potential Ghost Touch Sundering weapon that may come my way... well, nothing is full-proof, is it? :)
I found out, much to my astonishment, that divine might, maneuvers and smite can give me a chance even without the sword. I'll take the chance, I think.

(Unless they are corporeal undead or constructs. Then I'll surrender, I guess.)