High rise window treatment troubles are answered in Skyline by Hunter Douglas, http://www.hunterdouglas.com/hdg_product_detail.jsp?id=50 with panels 11.5 or 17 inches wide, the scale is right for your big tall windows.
But think beyond window treatments, because Skyline makes for a wonderful room divider- (just add the Room Divider Kit0 that opens and closes as you need it, and operates with an optional remote! Lots of material choices to suit your decor.
