Those Warbirds might actually not fly circles around you while laughing.
Honestly, the D'Deridex if they make one should have turn rate of 4. If they want to make it a bit more playable they'll have to give it a 6, but then bump the turn rate of all other ships in game by +2. Nowhere in hell should that thing have the same or better manuverability as a Galaxy for example.
Old D'Angelo had a game, E-I-E-I-O,
And in his game he had a grind, E-I-E-I-O,
With a nerf nerf here and a nerf nerf there,
Here nerf, there nerf, everywhere nerf nerf!
Old D'Angelo had a grind, E-I-E-I-O