Fafnir turrets should be given 360-degree rotation. This would give them four guns/turrets forward, which would allow for a bit more flexibility (such as putting Hellfire on a gun mount, while keeping 3 EMP weapons)
Note that the Eclipse and Nanda Devi are both setup this way, and they are both smaller and more agile than the Fafnir, so this should not present any kind of balance issue by itself.