It's possible that there is some other factor. Loot rarity doesn't change the DPS that much in a match. My fed guy doesn't have a tac console for extra damage and I was getting about 25k dmg per match with dual heavy. Klingons level 6-8 were getting about 40k and I was level 8 I think maybe 7. I don't know a tac console a really nice one helps a bunch but a tier 1 console doesn't add much.
Anyways I don't want them changing anything really as it low level or could just be a problem with the miranda maybe. I like my klingon character so need to be careful with any changes nerf wise .