Maybe make the battle razor and inferno and shield killer of generic weapon with each house having there own "brand" of it.
Liberty battle razor and infernos could be well-rounded.
Kursari battle razors and infernos, shield killers, could use less energy but do less damage
Rhienland battle razors and infernos, shield killers, could do more damage but have shorter range
Bretonia could have battle razors and infernos, shield killers, that have more range but use more energy.
Then have like a generic pirate battle razor and inferno which would be the same as liberty but does a little bit more damage and has a better range. As a side effect it is more expensive.