I might drop 3 spawn and purchase/convert 2 more obliterators and give the rhinos havoc launchers and give the squads lascannon/plasma gun. I think the greater range of the plasma gun and its ability to compliment the lascannon's anti-tank (against transports/light vehicles) and high strength and low ap would be the best choice for the troop squads.
also, I think I noticed how your lord was modeled with a plasma pistol, looks nice, but according to the spawn rules don't they NEED to move as far towards enemies as possible? Does that not mean that they must run in the shooting phase, making your lord unable to fire his gun?
Also I might not take icons of slaanesh, while its maybe a theme for you, I think that IoCG would be better suited for units on objectives that are inside rhinos
so anyways, the general list I would end up wanting (with this theme) would be.
HQ: 325
(170) Chaos Lord, MoS, steed, meltabombs, blissgiver
(155) Daemon Prince, MoS, wings, Lash
Troops: 470
(235) Chaos Marines x10, plasma gun, lascannon, IoCG, Rhino, havoc launcher
(235) Chaos Marines x10, plasma gun, lascannon, IoCG, Rhino, havoc launcher
Fast Attack: 680
(120) Chaos Spawn x3
(120) Chaos Spawn x3
(120) Chaos Spawn x3
(120) Chaos Spawn x3
(120) Chaos Spawn x3
(80) Chaos Spawn x2
Heavy Support: 375
(225) Obliterators x3
(150) Obliterators x2
1850 exactly. Its relatively similar to your other lists, yet it has 4 units that can target vehicles at long-medium distances and take them out. Also the havoc launchers help kill light infantry (which can be useful, as your only other long-ranged anti-infantry are plasma cannons, which may not want to fire at GEQ, and with lash of submission, you can take advantage of it and havoc launchers has 12" more range than plasma cannons and are more accurate.)
Not to mention it has 7 lascannons, nurgle loves your army now and will strike down all enemy tanks