I think you'd be better off dropping all the dissies for lances, and giving your warrior units blasters. Don't bother taking agonisers on warriors, because if you wanted a melee unit of troops you'd take wracks or wyches.
I'd drop both 9 man units, and both raiders. I'd give each unit of warriors a blaster, and give the archon without the relic pistol a blaster and his own venom to bring the relic pistol archon in with him before dropping off the relic pistol archon near a midfield objective.
If you have any points left try to bring more mandrakes, but put them in units of 5 instead of 10+ because they can have real trouble with leadership. Just because they are better at melee than scourges doesn't mean you should charge with them though. People will stay locked in combat just so you can't do mortal wounds. Don't feel like you need to DS right on 9", you can shoot from 18 and you're fast enough to keep up with most infantry if they run away.