The Cobra has the luxury of a very flexible weapons setup, so there is quite a bit that works well. With that said:
-If fixed weapons are your thing, the Class 2 slots up front are better since they're more likely to be able to both draw a bead (the class 1 slots are pretty far apart on your wingtips)
-At the same time, the placement of the Class 1 slots underneath the ship means that targets will need to be slightly below your view in order to lock on with gimballed weapons - which isn't terrible, but your target will be less visible.
I use twin fixed Class 2 beams in the front, and twin Class 1 seeker missile launchers below - works nicely against most targets, though I may be experimenting with the loadout soon in order to go big game hunting.
As RafeZetter said or 4x multis.Medium hardpoint: 2x Multi cannons Class 2 – 57,000 each
Small hardpoint: 2x Beam Laser Class 1 – 74,500 each
Medium hardpoint: 2x Multi cannons Class 2 – 57,000 each
Small hardpoint: 2x Beam Laser Class 1 – 74,500 each
Medium hardpoint: 2x Multi cannons Class 2 – 57,000 each
Small hardpoint: 2x Beam Laser Class 1 – 74,500 each
No likey...
2 x Class 2 Fixed Beam Lasers
2 x Class 1 Gimballed Multi Cannons
Gimballed multi cannons are generally more effective than gimballed lasers of any variety, and fixed lasers just aren't good in the class 1 slots on the Cobra. Fixed class 2 beams are expensive, but generally fantastic and the multis just compliment the DPS. RafeZetters setup is great on a Viper though.
I use something similar to you Hitsuke but can I ask why fix the beams instead of gimbal. Is it just they are more powerful or is it that you don't need to gimbal to aim at Shields as much.