Ray,
I'm not sure that I understood your last post. I'm pretty sure that both Son and Rumba (in 4/4 and 6/8) clave can be played 3,2 or 2,3. In my listening and learning, I have heard guauanco played mostly with Rumba Clave.
I agree that playing against Son and Rumba clave sounds nice. It is cool when there are an odd number of bars in a phrase and, instead of transitioning with the clave, the rest of the rhythm section just plays against clave for a while. Generally, the clave turns back around (with another odd number of bars in a phrase) and the resulting tension and resolution caused by playing against the clave for a while is really cool.
I'm glad that folks appreciate this topic. I am new to rumba and new to a detailed study of Latin music, so I have lots of questions.
Thanks,
Zach