Without knowing too much about Eldar, I still think I can help by coming at this from a different angle.
These are the units you have in common between both lists.
Farseer spirit stones runes of warding doom fortune 150
10 striking scorpions exarch scorp claw stalker shadowstrike 212
10 striking scorpions exarch scorp claw stalker shadowstrike 212
10 harlequins troupe master shadowseer 10 harle kiss 266
10 dire avengers exarch pw+shimmershield bladestorm defend 177
10 dire avengers exarch pw+shimmershield bladestorm defend 177
2 waveserpents with starcannons vectored engines spirit stones 310
2 warp hunters spirit stones holo-fields 340
Bike or not, the Farseer is otherwise identical.
So let's assume the above common units are your core, and build from there. That's a total of 1844 points spent by my count.
How can the remaining 656 points help those units? Do you see any glaring holes that need to be filled?
Fire Warriors are great. And that's all I got. Need to brush up on my Eldar.