Scott,
It's Uncle Dave (using Fran's pc). My stand has the boom attachments more centered than your's, so my right is really more of a right/center .... it comes in about at G5 on the psr21k. Any full size kb should be about G#5( )
My reason was more of a doubling convienience as a guitarist...... needing to have the mic stay out of the way of my left hand, where I'd move on the neck more.