I'm pretty sure it's the other way around. Two flare buckets of 30 each, and the single chaff bucket. Also, the chaff shoot up and out from the tail, so it shouldn't be affected much by the rotor wash I don't think.
As for why so few, the U.S. has always (to my memory) used flared reactively when a missile is shot at them, whereas the Russians have used them proactively, firing them off in a program for the entire time they are in an area with a suspected IR missile threat.