I'd worry about the Raiders getting blown up before they start doing anything too significant (IE: Tank shocking). I thought Tank Shocking was down solely in the movement phase, so I'll have to double check that (in which case your range would be limited).
It'd probably be better to always go for Cluster Caltrops first on Reavers, and then upgrade to Heat Lances. I'm a huge fan of Heat Lances, and personally feel Reavers are a super unit with HLs and CCs to deal with smaller, cheaper vehicles (like Rhinos and such). I'd field them in smaller units of 3 as long as FA slots permit, though, because you can always run them close by each other to "Act" as a single unit if that's your goal. And then one well placed flamer (IE: Heavy Incinerator from a Dreadknight, IE: Baleflamer from a Heldrake) won't take out the entire unit.
Your Archon doesn't have a role at the moment, it appears, other than just generic junky with a high BS blaster. This is how I run mine, personally, but without a unit to WWP in, the Shadowfield is going to be a bit wasted, and quite expensive. Grab a 10 point Lhamean flunky, or make him cheaper to toss points other places, because at the moment it looks like he'll be the lone survivor in a wreckage of a Raider and the warriors he accompanies. Keeping him cheap may make you give up Slay the Warlord easier, but at least it gives you more points to add firepower that can get you First Blood to make up for it. You can always field him on his own behind LoS and keep him safe that way.
You definitely need some Dark Lances, so I'd add them to your Ravagers ASAP. Maybe even toss some on a few Raiders. The best way to break any perception of target priority is to have strong units capable of doing whatever needs to be done. Dark Eldar can field mass amounts of things that can handle multiple tasks on the battlefield - so utilizing that is going to be one of your best assests. x10 Warriors with a Blaster and Splinter Cannon sitting in a Raider with Splinter Racks and a Dark lance can plink away at almost everything in the game pretty well. Reavers with Cluster Caltrops, a few guys for fodder, and heat lances can tackle anything on the table if the rolls are with you. A Razorwing Jetfighter that's lacking Dark Lances isn't really scary, especially after it's missiles are unloaded. You won't end up taking down an Imperial Knight with a Shock Prow ramming, and you won't be dealing with the equally speedy and much more deadly Wave Serpent.