Thank you, that helps a lot. It also makes me realize something about out Brig design. The Fatesever point defense weapon costs 10,800 EP (108 NEP if I understand it correctly), twice the cost of the Brigs main cannon.
From this, we have two main options to change our Point Defense to. Las and Fusion Mortars. Las point defense is the cheapest we got and are reasonably effective. However, I would argue that due to the immense price of Brigs we should go with something a bit more effective. Fusion Mortars would be idea to deal with massive waves of low quality Ork bombers and torpedoes.
Fusion Mortar Point Defense: 57.6 NEP
Las Point Defense: 36 NEP