Semi-competive dark eldar/covens 1850pt list

Returning Dark Eldar player, last played back in 3rd edition. Would really appreciate some veterans having a look over my list and pointing out any shortcomings so I don't get completely stomped. I love Covens and wanted a semi-competitive but fluffy list. Couldn't really find a way to use the Covens supplement and include all the main dark elder units I wanted to use. I was considering dropping the 2 Talos and bikes for a dark artisan formation with a webway portal to help the wracks. I also tried to keep upgrades cheap. Anyhow any thoughts would be welcome

HQ

Haemonculus
Scissor hand  
Liquifier Gun
w/ 4 x Grots (see below)
95pts

TROOPS

5 x Kabalite Warriors
Blaster
Venom w/ Splinter Canon
120pts

5 x Kabalite Warriors
Blaster
Venom w/ Splinter Canon
120pts

ELITES

10 x Wracks
Acothyst w/ Scissor hand
2 x Liquifier Gun
Raider  w/ Dark Lance
Night Shields
225pts

10 x Wracks
Acothyst w/ Scissor hand
2 x Liquifier Gun
Raider  w/ Dark Lance
Night Shields
225pts

4 x Grotesques
Aberration w/ Scissor hand
Raider  w/ Disintegrator
Night Shields
235pts

FAST ATTACK

Razorwing w/ 2 Dark Lance
Splinter Canon
Monoscythe Missiles
150pts

6 x Reavers
2x Cluster caltrop
2 x Heat lance
166pts

HEAVY SUPPORT

2 x Talos Pain Engine
Chain Flails & Twin linked Haywire Blaster
270pts

Ravager w/ Dark Lances
125pts

Ravager w/ Dark Lances
125pts

1850pts

When you said Dark Eldar/Covens, I thought you were going with some stuff from the supplement.
You might be better off going with your main detachment as the supplement (they get heaps of good buffs from the DE codex.
If you want DE stuff, just run with a DE allied detachment