Why not rework the Valiant instead?
Increase the range and damage of the Valiant to mimic that of the Summit.
High alpha damage, long-range, very high HP, and low fire rate. 85 range perhaps?
Just an idea - This way the Valiant has the capability to actually combat other destroyers.
With its alpha damage, it would also retain its brawler effectiveness.
Though, on second thought, this may not solve the issue.
A 2nd idea is to increase the range a little bit. 60 -> 70?
This way it isn't massively overshadowed by the other factions and their range, but increasing the range would grant it a better chance at engaging from distance, as well.
~ Stryker