I've been doodling around with Chaos for a few months now, and while I'm no expert, I'll give you my thoughts:
That armored company is too small. With only four tanks, just getting shot at once and taking one casualty will put you in serious danger of being broken. All it would take is getting shot at one more time to break. I'd suggest making your armored company BIG, 6-8 tanks! You want your enemy to fear them, not just see those tanks as a minor irritant.
I have not played with Decimators yet so I can't really speak about them, all I would say is position them in the middle of the board at the start of the game so you can easily head wherever they are needed. Remember, Decimators are SLOW so you can't put them in a position where they have to maneuver too much to get where you need them to be.
Personally, I'm a big fan of raptors with a sorcerer leading them. Terminators are certainly nice, and that daemon prince leading them makes them that much more deadly, but they aren't fast and Chaos doesn't have the best strategy rating.....and if you lose initiative on the turn they teleport in, your enemy will just move away from them at the start of the turn. With raptors, you can move fast and quickly get them to where they need to be. And by having a sorcerer leading them, you don't need to get base-to-base to get the MW attack.
In an ideal world you could save the activations of these three units until the end of turn 1, then double up with the Decimators, armored company, and raptors, to get each in a position where each threatens to sustain fire/engage on turn 2....that way your opponent can't get out of the way fast enough to avoid everything. If you do want to keep the terminators, substitute them for the raptors in the above scenario so again, somebody is going to get hammered.
I would drop the third retinue. Doesn't do a lot for you, and you can use the points elsewhere.
IMHO, obliterators are overpriced for what you get. You've got your fighters for AA, I don't think you need to sink the points into multiple obliterators.
Raptors also are comparable in price to bikes and move just about as fast, but they can move into buildings and take cover, which adds to their survivability.
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