Thanks for the input, it seems two other people from the internet are with you

I think I agree myself in hindsight. I've got bucket-loads of anti-infantry firepower, I think I need to focus on denying psychic stupidity and bringing down wraithknights / super heavies...
The lower model count will be a positive too in terms of getting games finished on time! Here's the proposed list in full then. I went with 2 melta guns on the third biker unit to give some extra punch vs imperial knights etc.
Guard
CAD, containing two Infantry Platoons 966pts
Company Command Squad with Master of the Ordnance 80pts
3 Priests 75pts
Platoon command squad with Autocannon + bolter 41pts
Platoon command squad with Autocannon + bolter 41pts
2 Combined Platoon Infantry Squads 142pts
• 2 Lascannon heavy weapon teams
• 2 Bolters (on the sergeants)
• Accompanied by inquisitor
2 Combined Platoon Infantry Squads 122pts
• 2 autocannon heavy weapon teams
• 2 Bolters (on the sergeants)
• Accompanied by Priest (the warlord)
45 conscripts (accompanied by a priest and Coteaz) 135pts
45 conscripts (accompanied by a priest) 135pts
Wyvern 65pts
Wyvern 65pts
Wyvern 65pts
Inquisition Detachment – 169pts
Coteaz 100pts
Inquisitor with 3 servo skulls 34pts
Henchmen warband – psyker + 4 bolter acolytes, one with melta bomb 35pts
3 Ravenwing attack squadrons - 575pts (land speeders gain scout and +1BS bonus if bikers target a unit hit by the land speeder)
3 Ravenwing Bikers – 2 Grav Guns and Combi Grav Gun on sergeant 115pts
Ravenwing Land speeder with multi melta and assault cannon 80pts
3 Ravenwing Bikers – 2 Grav Guns and Combi Grav Gun on sergeant 115pts
Ravenwing Land speeder with multi melta and assault cannon 80pts
3 Ravenwing Bikers – 2 melta guns + Combi Grav Gun on sergeant 105pts
Ravenwing Land speeder with multi melta and assault cannon 80pts
Culexus assassin 140pts