See how you go with it, having that many guns is alot of fun although it does get stale quickly I used to run 8 venoms all the time.
The haeme is an easy warlord point for your opponents once you start getting to this size game the other guys will have better warlords, I only take a haeme as my single warlord below 1000pts.
You could drop the wracks and haeme and have a shooty archon, give him a blaster, huskblade, soul trap, and a shadow field.
That's 150 points.
Will give you some needed CC bite if the unit gets charged and he will be deadly with his blaster.
You could always give him two blast pistols as he will be able shoot both, but they are only 6" range.