I like a lot of stuff in this mod (and I REALLY like Exalted) but the Catapult is pushing me to drop Keruvim entirely. It has comparable mobility to pirate Falcons and way more firepower; similar role to a Gryphon but close to uncatchable - ends up infecting fleets everywhere to the point that it largely replaces pirate Falcons. You have the choice of hunting it down with multiple destroyers (the only things that stand a reasonable chance of catching it, with the firepower to do something about it - if I send anything heavier it just kites them) or focusing most/all your fighters on it, or just letting it pound you. The ones I run into seem to always have safety overrides and heavy armor, zipping all over the place while pouring an endless torrent of missiles in my face. Really annoying.
I salvaged 4 from pirates, slapped on whatever random crap I had, and used them as an expendable first wave to attack a star fortress with the idea that they'd soak up a lot of fighters and missiles while my heavies got into position, and when they'd explode I could bring in my glass cannons. The damn things survived the whole fight and did about half the total damage needed to kill the station. Just for a start it ought to lose Burn Drive, or have its maneuverability and/or hull/armor cut significantly.