I'm using this very same setup on the Hoplite and is really effective: the M7A with 6km range is a really snipe weapon and can get rid of small/medium target with a couple of shot, if target get pass that 4 BVRS overclocked grant an almost constant laser stream and can take donw or heavily damage a target in a single burst......
I suggest go 4 BVRS in the nose for high speed to target, and real damage from first hit, and the M7A on the chin since it has the same pip. Two stage trigger fires unlimited ammo out to 5km with the laser, and squeeze a little more when your target gets near 2 km. Using the same pip for both weapons should result in more hits and faster kills.
I'll like to go ballistics usually, but both the cannon and the repeater for the Vanguard nose have a ridiculus amount of ammo, you'll run dry to fast for my taste, especially on the repeaters.