2000 Points vs Genestealers

Got my first game against Genestealers coming up in a few weeks against a friend. I haven't faced the codex before, and haven't seen the army on the table since early Index play, so I'm hoping for some insight from people who've had experience with the army.

Detachment limitations and Rule of Three aren't an issue in this case, I'm just wanting a victory, as he's been tabling most of his opponents with the dex, apparently.

Obsidian Rose Battalion - 5CP - 640 points

Archon - Huskblade - Splinter Pistol: 76 points
Archon - Huskblade - Splinter Pistol: 76 points

5x Kabalites - Blaster: 47 points
5x Kabalites - Blaster: 47 points
5x Kabalites - Blaster: 47 points
5x Kabalites - Blaster: 47 points

Venom - 2x Splinter Cannons: 75 points
Venom - 2x Splinter Cannons: 75 points
Venom - 2x Splinter Cannons: 75 points
Venom - 2x Splinter Cannons: 75 points

Black Heart Spearhead - 1CP - 454 points

Archon - Huskblade - Splinter Pistol - Phantasm Grenade Launcher: 79 Points
Warlord: LC
Relic: Writ of the Living Muse

Ravager - 3x Dissies: 125 Points
Ravager - 3x Dissies: 125 Points
Ravager - 3x Dissies: 125 Points

Prophets of Flesh Vanguard - 1CP - 405 points

Urien Rakarth: 90 points
Diabolical Soothsayer (AoA)

3x Grotesques: 105 points
3x Grotesques: 105 points
3x Grotesques: 105 points

Alaitoc Patrol - 0CP - 500 points

Farseer Skyrunner - Witchblade: 132 points
Powers: Doom - Fortune

5x Rangers - 60 points

9x Shining Spears - Star Lance: 308 points

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Total Points: 1999
Total CP: 9 + d3

What I'm looking for is some general strategies to use against a Cults list, how to deploy namely, and if there's any glaring flaws in my list as it stands.

Thanks, all!

What I found essential against GSC was big blobs of grotesques backed by a vexator mask.
GSC have some nasty units which can arrive from reserve and reliably charge, and wipe out whatever they attack. If you wrap your squishy stuff in a big unit of grotesques where everyone is close to the vexator mask, you can strike first and usually kill the charging unit before they attack.

If you can change your list, try getting a second haem to hold the vexator mask, and maybe some more grotesques. Shining spears might be ok, but they are vulnerable to the units charging from reserve.