Okay, on the remarks about the ships put foreword.
Desolator:
I don't know about the design changes for this ship, I always viewed it as it being a fast, not the strongest, but nimble battleship. Meant for speed and attacking smaller ships. When i view it firing, i always viewed it as a 'staggered' fire, not all of the weapons opening up in the same salvo.
Increasing it's lance strength to 6, and adding it's speed and torpedo value... that would make it better then the Apocalypse battleship.
Personally, I like the idea of it staying the way it is. a Cheap, 300 point battleship with acceptable firepower.
Lets not forget that Chaos's punch comes from the cruisers. The IN relies on their battleships for real whack.
Despoiler
Again... not what the despoiler was meant for.. If you Wanted it to be punchy, keep it's prow lances, however it's the torpedos that really make this ship dangerous (added with it's launch capacity)
So on that note, I say leave the ships be. If they were going to be changed from what they are, it would have happened by now.
If you want punch in a battleship, take the planet killer, otherwise, rely on the repulsive and your other cruisers.