Okay, I've had a think about things over the weekend. I'm not sure about contacting the organiser as I've already asked some questions and I don't want to spam the poor guy. Eldrad is powerful so I'm going to assume he is out - Illic, however, is sub-optimal so I think he will be fine.
I liked the Ulthwe list suggested by Magenb, but I won't be buying any Hemlocks at the moment. My gaming friends (who have much more experience with 40k than me) consider them overpowered for their cost and having been run over by a pair of them and a Crimson Hunter Exarch myself at my first tournament I'd put them squarely in the 'highly competitive' box that the organiser is encouraging us to avoid.
Sorry for being blunt, but I just can't help mentioning that this line of thinking is... well, a bit odd. 40k is a game where one person wins and the other one loses. And that's normal. But - by all means please correct me if I'm wrong - you sound like you want to be nice to everyone, and being nice = not winning too much (ideally not winning at all!). Well, if you feel highly concerned with being nice to everyone - it's probably better not to play Craftworld Eldar at all. You see, it just happens so that Eldar as an army tend to cause no end of frustration in other people - in fact, you probably should be prepared to see that whenever you win a game, your opponent will grumble that it's because your army is OP. And on like 50% of times when you
lose a game, your victorious opponent will still grumble that your army is OP and needs a nerfbat. And only if you deliberately fill your list with the worst and most sub-optimal choices from the codex - only then, after totally trampling your army into dust, your opponent might grudgingly agree that this is the right and fair way to field Eldar.
Now, this all boils down to the general culture that exists in a specific community. I did happen to play in groups with very healthy attitude, where noone pays attention to how "OP" someone's list is - everyone just plays against whatever they happen to face and tries to do as best they can and have fun in the process. Most groups, however, are dominated by people who get more or less salty when they lose, and so are very quick to label all opponents they can't beat "WAAC" and their lists "OP" and "broken". And, frankly speaking, when I read the words of the TO that you quoted, they also strike me as words of a person who's overly concerned with penalising "OP" lists, which means he's likely addressing a community of the latter type.
Sorry for this long speech
what I'm trying to say is that
if you happen to play in a community where people tend to be highly concerned with "OP-ness" of other people's lists, you should be prepared to have your army labelled "OP" just for being Eldar, almost regardless of what specific units you bring (and sometimes even regardless of how often you actually win for that matter). So, if I were you, I'd just go with what feels cool and good for theme and overall synergy
Alaitoc Battalion
Warlord Autarch with Reaper Launcher + Incomparable Hunter
Illic Nightspear
Warlock (Conceal/Reveal)
5 x Rangers
5 x Rangers
5 x Rangers
4 x Striking Scorpions + Exarch
4 x Swooping Hawk + Exarch
4 x Swooping Hawk + Exarch
Wave Serpent with Shuriken Cannons
Alaitoc Spearhead
Farseer (Guide, Doom)
Warlock (Protect/Jinx)
6 x Dark Reaper + Exarch Tempest Launcher
2 x Fire Prism (I'm intending to proxy Warp Hunters as I love the model and dislike the Prism)
3 x War Walker (2 Brightlance, 2 Starcannon, 2 Shuriken Cannon)
1749 points
This is a good and balanced list overall. One element that is 99% useless is the unit of Striking Scorpions: they are weak in close combat, and with beta deep-strike rules they are also very difficult to get anywhere. At the same time, your list overall distinctly lacks anti-tank; therefore I'd suggest to drop the scorps and use the points to equip all three War Walkers with lances.
Good luck!