...the K'vort is the same length as the Hegh'ta, just with more mass. It should be a raider. Probably have slightly more hull and 1 less turn. I also think it should be given a 4/2/4 (eng/sci/tac) console layout (for the fleet version). And obviously, the wings shouldn't go down when attacking (as seen on the show).
So, ya, that would be my number 1. My number 2 would be a buff to raiders to make them more competitive.