Not evidence but honest comparison, by numbers, I don't want to go untangling this mess with emotional claims as the only backing. Getting lascannons isn't easy, mind you, compared to the other weapons you mentioned (in passing, again, nothing concrete).
Ramjet is potentially your first heavy weapon (other is Quadcannon), costs you almost nothing but money, and is sold by shady characters. Figures it's crappy (maybe bit too much indeed). It does outrange all crappy enemy ships, tho.
As for gauss cannon, it is still lower on the list than lascannon, you can loot it pretty easily off enemies. If it sucks too much, we can think about buffing it.
The base for CLC nerfing suggestion is pretty much the same as for the Impaler. Aquire of the latter leads to the drastical change in the overall strategy of the game, that's what implied. For the Impaler it was too easy to lay down the strongest enemies (again, no ammo and supreme accuracy) in 2-3 shots.
For the CLC the change consists of switching to the globe, with possibility of the complete ignoring of the battlescape missions (average score of 5000 makes fun of the Pogroms and Cullings too). The ammo-independency makes this part of the Piratez non-Challenging, results in the fast income growth. And then you just find yourself with top-tier tech and even less challenge.
CLC is indeed not the first weapon to equip the ship with, but it is not that hard to aquire. The only component usually missing is Heavy Couplings, not actually that rare.
The ammo load of 50 charges each gives a possible 3600 DP for a interceptor with two, and 7200 DP for a interceptor with four. Again, with fine accuracy and fast reburst. Another competitive option - the missiles - do not deal the instant damage, it takes time to reach the target, countrary to the beam.
For all you guys who tell that CLC suck: you are correct within the absolute scale. But for the moment it is a balance-changing weapon for almost no price. Medium interceptor with two CLC's brings down the Heavy Freighter and has a good chance of bringing down the Science Vessel. In my opinion - it is not balanced for the swarm-tactics which has huge potential within this game.
For the summary, my suggestion is that Gauss seems lacking the range and piercing potential, Ramjet is suggested to be buffed for it's price only.
And CLC must have an operation price, compared to 4-6K/shot. At least within the electricity bills
Or nerfed to 10-16 DPS, as mentioned.