It's really unfortunate that I have to say this, but it should be said: Craftworld Eldar sort of do the freakshow list better than the freakshow. They really are an auto-include, imo.
The ammount of points you're investing into the harlies side of things just to get that -2 leadership is high. The heroes path has never sat well with me, because I feel like all of them are just too vulnerable to really be a factor in the game more than once. And if I'm only using that -2 leadership from the shadowseer once, I may as well save myself 300 points and buy a 25 point archangel of pain instead, for the same -2 leadership.
I think you'd profit more by having an ability that reliably did more wounds to a wider array of target units than to worry about an extra -2. Psychic shriek does just that and benefits from the -3 you already have. You don't have to worry about not effecting fearless or ATSKNF units.
Here is what I'd do:
Drop the heroes path, the haywire grenades from the succy and the 2 fast attack venoms. - 440pts
Replace them with a seer council(on foot) with 5 warlocks w/4 singing spears, and 2 Farseers w/singing spears. Give your succubus a webway portal. -440 pts
When you roll your psychic powers, you start with 1 of the farseers and roll on santic daemonology. You want sancuary(+1 invuln), cleansing flame(S5 nova power), vortex of doom(Vortex D weapon), and gate of infinity. All these powers are useful to the unit, but your primary goal and purpose is gate of infinity. If you get gate, awesome. Move forward and roll on runes of battle for the warlocks, and telepathy for the other farseer. If you DON'T get gate, roll on sanctic for the warlocks next. They can't reroll their psychic powers if they take a perils, but you can just kill one and still have all your powers and such. If they ALSO don't get sanctic, you have to roll at least 2 of the last farseer's powers on sanctic to keep trying, saving the last roll for psychic shriek. If you follow my plan, having multiple redundancies, 4 out of 5 times, you will have gate of infinity and a webway portal, allowing you to teleport around the board without scattering, tossing S9 singing spears at things, hitting things with 18 inch AoE nova powers(9 inch each direction), and psychic shrieking at -3 leadership.
The 1 out of 5 times you don't get gate of infinity, you just have to plan to drop the council(with the succubus/wwp) in from deep strike, getting 1 really good round in with all their AoEs. Even on the 20% of games that you don't get gate of infinity, I think this unit will outperform, or at least equally perform compared to the heroes path & 2 venoms. But the upside on the 80% of times it DOES succeed in getting what you want FAR surpasses them.
I played a similar list at the LVO recently and did very well. But it was 1850 and I actually had Eldrad in addition too, which basically all but guaranteed me gate of infinity every game.
P.S. Enjoyed your battle reports! Good luck!