I never said I had problems holding up a powerful 6 beam broadside, I get 800-1300 and usually no lower than 600-700 at the end of a volley (I use a Mk XI Rare EPS flow reg, try it, it moved my weapon power low from 75 to 90-95) it just feels somewhat underwhelming
The thing is though, we aren't the main damage dealers. We're the support pressure damage. Emphasis on support. Yes, I know in canon the cruisers were the lords of space, with their massive phaser arrays laying down the law in the name of the UFP, but alas, it's not that way in this game. And if it was, your Excelsior would probably be a heck of a lot weaker than it is XP.
But I would support the passive weak nadion inversion on cruisers. But if we're going into what they may/may not need, I would also vie for a passive threat generation bonus on cruisers, AND increased innate accuracy of BAs. Not by much, maybe 5% for the accuracy, and maybe the equivalent of the first 3 points in TC. As for the passive nadion, maybe a 25% decrease in energy consumption. If that's too much, then reduce it to 20%. I would actually settle for 10% tbh.
Do that (and the universally agreed on +2 turn rate increase), and I think a LOT of these kinds of threads would die overnight. Also, with just these tiny bonuses/changes, you would not infringe upon escorts or science ships. At all.