This list looks like it could be lots of fun. However, if this is a battle forged army (which it presumably is), the allied detachment has to be chosen from a different faction to your primary one, just like in the last edition.
I don't think this is particularly traditional, as lists go (triple Taloi and very coven heavy overall, Trueborn with lances instead of blasters, etc). That's not to say it won't do well obviously, but I do think your pain engines will struggle to get there. Having three allows you a degree of safety there of course, as it means two of them will probably survive, but they will still be very plodding. Hammer and Anvil deployment will be their bane.
The Trueborn without transportation concern me too. If they take one casualty (inevitable) they will be testing for leadership instantly. I'd think they'd be more useful as one squad in a transport. Personally I prefer blasters to lances because they can move in a vehicle and fire them, but if they work for you then fine.
Also, no Venoms? I think you might be lacking in anti infantry fire slightly. I'd be tempted to swap out a couple of Raiders for Venoms. They're obviously not quite as resilient (if such a word can ever be employed to describe a Dark Eldar vehicle) as Raiders, but they pump out a lot of shots. Also, the shape they are means they screen Raiders nicely.
My other car is a Ravager