I don`t have full game so i don`t know how the 90mm gun or the today tempest looks but i mean this is good time to add new weapon.
If you read the history of the Rim you see the LiveShips lost their abylyties to build hovercrafts, the tempest and the hurrican are the only exeption. If these smarter LiveShips can build hovercrafts, they can know some extra weaponary too!
I mean that hoover craft have Big energy sources cause it needs lots of energy to hover. I mean it is good place where we can start test some new nonchemical energy weapon. What about some bigger IC (OMG 75mm IC)? Something with hight velocity, and nonballistic trace! Ion cannon, Plasma cannon, Electro magnetic cannon that can shoot steel monolith shells in terrible velocity!
It should get some weapon specially for it, I mean the tempest can get role of assasin or/and sniper!