[Plugin: Google Maps via Store Locator Plus] Setting primary location

We have a number of locations in a particular city (Auckland). When viewing the map and clicking on auckland, one of our smaller subsidiary clinics shows and our primary location pin is hidden behind it. Until a user zooms in close enough to separate the flags, this subsidiary location will be found first. We would like our primary location (head office) to come up when a user clicks a pin in Auckland. I have tried re-ordering the head office such that it is the most recent location added but this didn’t do anything. Is it possible to define the primary location so that ausers clicking a flag on Auckland will get head office details first?

Thanks,
TT
http://www.topcatt.com.au/option2

http://ww.wp.xz.cn/extend/plugins/store-locator-le/