Ya said it all. You want to point your nose at a cube or a gateway, park, and unload without getting oneshotted. You want a PvE I win button.
Reality is this ship turns too slow to really use duals. Singles will work fine and because they have a higher rate of fire offer more chances to crit in a given salvo.
The build I was thinking about would be a shield stripper with four tetryon turrets aft, a single tetryon cannon with a tetryon DBB front and two quantums for my final punch. Work your universal stations right and you should be able to get CRF1, FAW1 and THY to go off all at the same time. You should be able to double up on more than one of those three so you can roll them more often. Hide a copy of DEM on there somewhere and you should not need dual heavies with a build like that.