I'm not a massive fan of Slaanesh DPs. Khorne kill better, Nurgle survive & kill better, Tzeentch shoot better. I just don't see a niche for them.
Otherwise I like what you have going on here. A nice balance of units & abilities. I personally start with a Greater Daemon but you have two DPs so I don't think you'll have a problem... That said I would much rather go with a second Nurgle DP, they are expensive but take a good kicking & do get the job done
1000 points is very tough, if it was my list I'd drop the Slaanesh DP & HOT & just add a Greater Daemon and another Bloodcrusher with Icon.