There's a reason both Shimano and Campagnolo have moved to dual pivots, they work better! Campy reserves the dual pivot brake for the front on many of their groups because the extra stopping power is most useful there. Shimano just uses dual pivot on both ends.

My understanding is that these newer brakesets are designed with a specific lever in mind. Mixing new with old may lead to problems because the cable pull may not be appropriate.

Good luck.

Ed