I have made a few more changes to the list after some more playtesting. I replaced the Vindicator after losing it's cannon in 3 games and replaced it with an AC/LC predator sporting a Dirge caster. Yup I got to expireince Flamers of Tzeentch in my backfield this weekend, the result was ouch!
I also ditched the Leman Russ for a reactionary unit of Terminators, they will protect the Warpsmith and can engage anything that gets in my backfield. I also used these points to give the CCW's to the Chaos Marine squads; I feel I need a leg up on those space marines I keep facing.
I also dumped the cultists for 2 more IG squads that will blob with a commissar. This should be much more effective than the cultists.
While I liked lobbing those three pie plates a turn I think this list in more effective.
Also I just want to point out the Defiler is a workhorse in this list! It really has been great; even though I still think it is about 15-20pts overcosted. That said it is really resilient now. It has only gone down in 2 of 6 games.
2000 point Chaos Marine List with Traitor Guard allies (1290pts)
HQ (125pts)
Warpsmith
Aura of Dark Glory
Total: 125pts
Elite (105pts)
Terminator Squad Crixus (3)
2 Combi-plasma’s
Total: 105pts
Troops (398pts)
Marine squad Decimus (10)
Plasma gun, Autocannon, 8 CCW, Vets long war
Champion with Chain Axe
Total: 199pts
Marine squad Barbarus (10)
Plasma gun, Autocannon, 8 CCW, Vets long war
Champion with Chain Axe
Total: 199pts
Fast Attack (207pts)
Bike squad Agron (6)
2 Melta guns, Vets long war, Mark of Nurgle
Champion with Power weapon
Total: 207pts
Heavy Support (455pts)
Defiler
Total: 195pts
Predator
TLLC, Lascannon Sponsons
Total: 140pts
Predator
Lascannon Sponsons, dirge caster
Total: 120pts
Traitor Guard Allies (610pts)
HQ (90pts)
Lord Commissar
Power Weapon, Camo cloak
Total: 90pts
Elite (65pts)
Guardsman Marbo
Total: 65pts
Troops (325pts)
Traitor Guard Platoon
Command squad
4 Flamers
Total: 50pts
Guard squad
Grenade Launcher, Autocannon
Total: 65pts
Guard squad
Grenade Launcher, Autocannon
Total: 65pts
Guard squad
Flamer
Commissar
Total: 90pts
Guard squad
Flamer
Total: 55pts
Fast Attack (130pts)
Vendetta
Total: 130
Fortification (100pts)
Aegis Defense Line
Quad Gun
Total: 100pts