Ok, I'm too lazy to log in just to check your build, but from what I can gather you're using WS , SY!, and CV. Chances are if you have SY!, then you also have AoHM.
So far, it looks pretty solid to me as a general build. WS+SY! is one of the few dervish builds that a sin or warrior can't do better (scythe warrior can't spam DW, scythe sin can't spam SY!).
However, if you're doing gate of madness, this build won't work (I know that from experience, and I haven't even TRIED hm yet!). First off, you shouldn't be bringing WS (or any conditions except crippling, for that matter), because Shiro can transfer them to you with Impossible Odds (the only reason to bring crippling is to slow him down while you do the bonus). This is one of the rare cases where Vow of Strength is a great choice of elite, because there's no reason not to take it (well, assuming you bring a stance-ending skill like Wild Blow so you can knock Shiro out of Battle Scars).
I'd recommend studying what the wiki suggests about beating the mission, and then searching "gate of madness" on youtube. You'll find a couple videos of a guy doing the mission with H/H and giving tips along the way. It's very informative, and was key to helping me finally beat the mission. Plus, you get to listen to some cool metal while you watch.
