Hi, Mike,
Sorry I'm late with these responses but I'm actually having to work for my money this week.
Flooding an ama might help in a capsize, a la Corsair righting, but I haven't heard of a Rave capsizing. The pitchpole is the booger that is to be avoided with a Rave and flooding an ama would pull the boat to that side and I think the resultant attitude would be a pitchpole with a terrible list. It might invite turtling. I dunno.
I have floatation in the bow, the mast, in the amas. One does the best to avoid it but, like I said, I haven't heard of that many pitchpoles since the boat came out in 1999. It's not a bad habit; just something to be aware of. No multihull is for normal people. If we were normal we'd all be fishing for bass in a boat from Wal-Mart.