I've also noticed you have not shooty units other then the pavane and lash attacks. i would recommend so shooty units to take full advantage of pulling units towards/away from you. i would drop the lesser daemons and one of the HQs (i'd say the sorcerer) and use the points on noise marines, possibly using this configuration;
Chaos Marines (Allied Detachment)
HQ - Daemon Prince of Slaanesh {C} - Wings, Lash = 155 pts
Troop - 6 noise marines with 5 sonic blasters,1 blast master, personal icon = 190pts
Troop - 6 noise marines with 5 sonic blasters,1 blast master, personal icon = 190pts
ALLIES SUB-TOTAL - 535
leaving you at 1927pts but now leaving you with a legal army list. i would also recommend attaining some anti-tank units or upgrades as from experience people like to target the princes. also use the points to add flight to the Chaos Daemon's Daemon Prince as it will be a flying monstrous creature unlike the CSM one which is a jump monstrous creature.
EDIT:
I can't really vouch for the chariots as i have not used them but i'm not really impressed by the rules i'd drop them and either add an extra daemon prince or a Soul Grinder for anti-tank.