Hand Grenades work well.
I've been there on days like that. What I have noticed is they have the bait balled up and charge right thru the middle of the school with their mouths open to see what falls in. They are not selecting a single baitfish to run down...more of a stuff their mouth kind of thing. When it is like that you really stand little chance to catch them chasing them around the sound and casting into a school. I found that moving away from the school and looking for the "lone soldier" is a better approach. At least that has worked for me.
BTW, how was the fluking?