So by the looks of things you are not jumping on the new Ynnari hotness? Basically you can take all the good parts of the Harlies, and put them in with your DE, while buffing both.
Regardless if you go with the Ynnari or with vanilla, you really need to keep your upgrades in check. Even though the clowns hit like a ton of bricks, its still a challenge to get them INTO combat. Most canny players will shoot them from 36", and your T3 5++ doesnt do well against massed small arms fire.
For your DE portion, I would recomend starting with at least 3 squads of 5 warriors in a dual SC venom (costs only 105 pts). It gets you a fast ObSec unit that can shoot at range, move like the dickens, and even if the enemy kills your venom the warriors just jump out and hold your objective.
The Grotesquery formation is also cash-money. The Dark Artesian makes a tough distraction unit (when it finally arrives)