This is starting to sound like the BWO project. In BWO, sol node gets fixed, and the earth forces start attacking(i don't know why), but the earth forces don't have beams, they use torpedos(aka bombs), and the gtva uses beams in place of torpedos. In fs2, it's sort of similar, but in a different fashion. The shivans have great beams, and usually take down capships with capships. When terran or vasudans take down capships, they deploy bombers with torperdos(aka bombs). With all those bombers doing most of the work for say the ravana, the capship will add in some assistance with its beams(like the mission with the vindicator).
Also, i remember the mission you take down the ravana, it reminded me of being in a lake as a fish taking chomps out of the bigger fish (ravana). I swear, because the ursa's and a boanerges were flying all around the ravana launching their bombs like that. It reminded me of goldfish eating food in a fish tank.