I think there's a lot of good stuff in there that perhaps just needs a little rework.
You're better off with minimum squad size for marines, they're less likely to suffer from morale issues and it makes your opponent overkill them a lot.
I'm also not a fan of the dark apostle, he's really expensive for what you get, unless you have a silly model like a lord of skulls or falchion.
If you drop him and grab one more troops choice and 3x chaos spawn. You'll have a brigade and 5 extra cp
and lots more bodies.
So, I can't actually afford that without losing my reinforcement points, but a brigade is a great idea.
Losing the dark apostle, splitting up the chaos space marines, and adding another unit so I have 5 5-man unitise nice. Then 2 units of bikers plus a single chaos spawn.
What does this net me, 11CP?
Also, without large squads my buff spells aren't as useful. I'm thinking about dropping prescience and obviously incursion is now useless as I'm at 15 reinforcement points.