STSF part is about accurate though.
Dance works just fine for dex builds(23 dex and heigher). Basicaly you dodge as if your dex is 1 point better.
Whirlwind doesn't make your weapons harder to parry. It just increases the number of your attacks based on dex comparison. As 25 dex arial you will get the best number against 3 dex opponent which is not that hard to achive sometimes with hamstring and boneshatter.