I have to assume the Wyche drachite goes with the raider squad? i have to agree on the shadow field is an Archon bit of equipment, not a Wyche who gets the 4+ ward when she leaps into combat.
5 man raider squads are too small. They should be ten man squads.
The Blasters in the lance squads are...perhaps overkill. If the enemy is that close to a walking Dark Eldar squad, you're in deep trouble anyway, usually. I prefer (gasp) shredders in this situation, cause likely they're infantry getting close, and patterns make me happy.
People like to DP dreads........id rather have 4 S8 AP2 lance weapons than just 2. for 10 points its worth it....Makes them more concerned when DSing those dreads if they want them ore than just one turn.
Over all i liek the list....just for those 5 man raider squads i would have no upgrades......all they are is a DL delievry system...shouldnt cost more than 110pts for them. You need wariors in your retinue. You need something to soak up wounds when that raider goes down.....because 8/10 times it will get shot down.