[X] +2 Phaser Banks (1 Fore, 1 Aft) [4 Phaser Banks, 2 Launchers] [Cost: 14]
[X] Type-1 Shield System [Mature] [-25% Cost] [Cost: 3]
Going to agree with the folks saying it needs more punch than just the two phaser banks - if nothing else because this means that the port and starboard phaser banks can be dedicated to side-focused coverage, and it also makes attacking the ship from the front a non-starter due to widened "I can hit you with two phaser banks at once" arcs.
As for the ventral "blind spot", as noted that can be covered in a single ship simply by applying a roll input - which, as noted, makes it impossible to stay in that arc without a substantial edge in maneuverability. And when you're operating more than one of these ships, or escorting them, it'd be easy to have the escort/fellow ship cover that blind spot (flying in formation, two of these ships could fly cargo pod to cargo pod, covering their own blind spot by putting the other ship in it).