HMM, well that could be an interesting idea for Romulan ships: don't give them Dual Cannons forward, give them Dual Dannons to the rear.
On my little BOP I pack turrets on the back. If no one's behind me it lets me fire them forward along with my other cannons. If someone is behind me, popping rapid fire with the turrets tends to do the job of whittling down their shields as I come around to bring the rest of my weapons to join in.
A high yield transphasic volley in the face does wonders while the rest of my cannons are high speed pewpewing.