Hi Horizon!!
Hi,
City of Light
I am no such fan of 9 batteries (bfi/crippled), make them 8. Otherwise cool.
9 was a flavor-add that does two things. One, it’s Tzeentch’s favorite number. Two, it gives it's batteries the Styx launch-bay trick when crippled, where half of nine is five in BFG math.

For Tzeentch being the Lord of Change, the thought was that the oddness of it would be very themeful.
Wage of Sin
A Desolator with:
+ 6 launch bays
-15cm on the lances.
Surely this ship either: Drops speed or Drops AC to 4. I favour the latter. Fast Battleship Carrier.
Agreed, but like I said, reducing the launch bays makes this too expensive, and dropping the price drops it below flagship rank and NO we are NOT changing the flagship (most expensive ship) rules.
Vengeful Spirit
I understand Sigoroth, the vessel is based upon the skewed Despoiler design. Check the thread in the discussion area were we are discussing ships. No one likes the Despoiler design in relation to the model design.
Now the Vengeful Spirit, being different then the Despoiler could be made like you propose. BUT ONLY if the standard Despoiler profile is adjusted.
I hate it too! BOTH of my Despoilers are built with one gun deck and two lance decks to match the profile, and the whole POINT of the Vengeful Spirit is to provide an easy out so player can use the “right†Despoiler profile- you notice there is no limit as to how many Vengeful Spirit-type Chaos battlebarges are allowed in a fleet? Why do all this? We’re not changing the Despoiler profile (or any other core profiles) at this time. We can only justify changing profiles for ships GW acknowledges are broken if we want any of work we’ve done to pass muster at all.
Now there is something I would like to discuss with you off-line about a possible avenue to explore, but you have to e-mail me off-line about it…

Hecate
May be balanced (compared to Styx it trades 2 AC for 8wb) but I don't want another carrier in the Chaos fleet.
I’ll be honest with you. I really like the Hecate, and I REALLY liked the original Hecate profile PRECISELY because it behaved significantly different to a Styx in the Chaos fleet. The only reason why I acquiesced to making it a gun-Styx is because there wasn’t any neat way to fix the Inferno without borrowing the Murder prow, and the HA’s DEFINITELY did not want to create a cruiser/battlecruiser pair when BOTH ships are new-adds.
The Hecate has been around a very long time and is well-tested, especially using its original profile. I will find out the feeling with adding the Hecate using its original profile and dumping the Inferno entirely.
Cerberus
Since this is a Slaugher Battlecruiser it must have 30cm speed and 5d6 on AAF. All weapon ranges at 30cm. I mean, we have been very clear about that.
The Slaughter is already an odd duck. In game terms, it was created to give Chaos a short-range, hard-hitting bruiser as a counterpoint to the Dauntless that the fleet otherwise did not have. The Scartix coil provided a neat foil to explain letting travel faster than all the other cruisers, but this ship is already juicing a lot of firepower, even if it is close range. There is NO WAY we can justify creating an HC Slaughter AND give it the +5cm/+1AAF benefit as well. Chaos-range firepower on a super-fast cruiser is a no-go. If there is a lot of grief about this, we can just dump the ship and people can make one for house rules. You and I both have plenty of house-rules models that will never see the light of day as official rules so it’s not like killing the Cerberus is going to hurt the Chaos fleet.
Inferno
Drop it, not needed. Even less nice then a Hecate.
Done.

I notice you are pretty carrier-averse. I understand the sentiment, but as carriers are kind of the Chaos thing, it seems natural that they would have more kinds of these than other fleets. However, the Emasculator is old and well-tested. I never liked it because it seems more like a re-weaponed Carnage (kind of like the lance-Murder) than a cruiser class in its own right. If we get rid of the Inferno and Cerberus, what are your thoughts on slipping in the Emasculator? I have to get that by the HA’s, but I’m not going through the effort just to get my head hammered some more.

Fleet Lists
With the little differences isn't there a way to create this through a single page? Think about the enviroment when printing on paper.
It’s an electronic document, and most people I know only print what they will be using. Besides, the Plaguefleet already exists, and when I tried conglomerating all four flavors as options in a single fleet list, the result saved one page and was so clunky to read, it was worth the extra page to keep them separate.
Major point A
Daemonships
I would rather have updated rules on them then a Hecate or Inferno.
Horizon, this simply isn’t going to happen right now. If GW buys off on some game company like FFG taking over BFG, ideally just the rule-set while GW continues minting models, then of course we can revisit absolutely EVERYTHING!!! Profiles can be fixed, entire rule-sets can be changed, the works! I’d be more than happy to blow the dust off many of the ideas in the long-dead BFG 2.0 effort and pour it into this thing. At this time however that’s beyond the scope of what we’re doing here.
Major Point B
Tweaking
I am still preferring a change of all the ships in the blue book, armada and exisiting pdf's then adding new cruisers for Chaos. Adding the themed battleships to the Terminus Est is good. But instead of Hecate I rather see the Styx fixed as it should (260), instead of an unneeded Inferno I rather see a fixed Devestation (45cm lances). All about priorities. Instead of the Vengeful Spirit (less-needed battleship) I would rather see the correct Despoiler profile.
All in good will. 
Horizon, I feel you!!

We just can’t do that right now. If we try it, everything we’re trying to accomplish here will be for nothing. Not only will all the effort be wasted, but in the end the game will not be improved one iota. I’m not interested in losing the war just to prove a point.
- Nate