Klingon winning condition:
Kill 15 Federation ships.
This is the current mechanic in Deathmatch battles.
Klingons no longer have to worry about silly capture and hold mechanics and only have to do what they do best, blow up feds.
It will be far to easy to for a large group of Klingon to focus fire down those two or three escorts that are in a group again and again to get to the 15 kill limit. Your idea would be great if the feds just had cruisers and science vessels, but this would make escorts a liability for the feds, especially with the low kill count.