SykoCaster
Can I suggest adding "Spam Dervish" to the Don't section?
Make Barnacle Fluffs, Anchor Bugs and Water Spout take so much longer than necessary.
If used correctly, to push them all into one corner, that's fine.
But noone does that.
Try using hornet's nest. It creases far more havoc than dervish does.
Dervish only pushes the animated about an inch away (if that) and they almost immediately come back. Considering the havoc there is, most people aren't so focused on one particular fluff or bug that when they're pushed back, they notice some of their hits are missing. Plus, if you're using slash in mobs, you'll probably hit a few anyway. The last few animated shouldn't be hit with dervish (unless it's the final blow), but it's good in full mobs.
Plus, I've never had a problem with using dervish in sea spout groups - and I like to stack them.