So here's an update, and thanks for all the input, again.

We had a chat last night, and picked up an 8th member. This is NOT ideal, but we are going to have to work with it:

PLD
PLD
WHM
WHM
DRG
MNK
BRD
BLM

That's the best I could finagle in terms of people switching classes. The SCH changed to BRD for us, he's almost full DL and Relic, the +1 Dragoon is changing to PLD for us, who is also full DL and Relic.

Can we do ADS with BRD/PLD/MNK sharing the silences? I ran a spreadsheet and BRD/PLD doesn't make it past the 3rd Paralyze. I don't mess with MNK beyond getting Featherfoot for my WAR, but he told me there is an instant animation GCD Silence they have - can we just time it with the MNK and have the BRD play TP to mitigate the high MNK silence TP cost? Or is that dumb?