Do you need 3 farseers ? 530 pts on HQs is a third of your army, that's a lot.
Also, since you are fielding psychics, i think 1 squad of 9 Windriders would be better. That way you get them all to rerolls with "Guide", instead of only 3 per successful "Guide". And if you do so, you can fit your 3 FA slots (2 scourges, 1 Windriders) into your battalion, thus not needing the extra HQ (this could hand you, say, another dissie ravager ?
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My Kabal