So the phone just sees the Mini2 it is paired with.
When the Mini2 is by itself it acts a single mono speaker.
When the Mini2 is connected to another Mini2 then it keeps one left/right channel for itself and the other right/left channel is out the 2nd Mini2?
Well that is where I am skeptical, I think they are just two mono speakers. Did you modify the left/right channel so could independently control volume per pair so it is true stereo?