When I had the Drake I used a Dragoon Turret and 2 Dragoon Mk I's on it. I don't remember the class 3 guns, but I do remember they had a 4.00 refire rate and I'm pretty sure that I grabbed them off Xeno Startrackers, so whatever that gun is.
With the Drake I used 2 Dragoon Mk II's and 2 Dragoon Mk III's, and I finished the game with that loadout. And Driller mines, and Adv Countermeasures. I had a Cruise Disruptor, but in all honesty I don't remember ever firing it in the story missions.
Dagger in SP might actually work well with the gun loadout mostly but then switching the class 3 hardpoints to Slingshots for the generator mission might work. Arg! Now I have to try that!