As a PM and a frequent FC flyer, I would laugh at them if they told me to go board in either line. I figure, I will board when I want after they call out the initial boarding call. Whether it is Zone 1 or 9, it should not matter to Elite flyers when they board or which line they are in.
I always board in the normal line, I hardly ever use the breezeway, and never have been told to go to the breezeway line.
Just my two cents.
Im not a overhead bin maniac.