Interesting list, this'd be a pain to go up against.
My daemonic knowledge is limited, but let me see if I can help.
I'd drop Phlegm from your Soulgrinders. Slaanesh grinders are meant to run up and be in the face of your opponent as fast as possible. Phlegm takes away from that because it'll make you consider not moving them as much, which should never be an option.
Honestly, I'd drop one of you Keeper of Secrets...s (don't know the plural form of that haha.) With two grinders and a lone
KoS you'll have plenty of heavy hitters at this points level. What I highly recommend you trade them out for is a big blob (or two) of Seekers. I've heard great things about them and have seen just how fast they are in several bat reps.
Unfortunately, I can't comment much more than that. I'm not familiar enough with their codex to critique it without the book in front of me. Hope this helps though