This list is similar to a variant I use competitively on occasion. I do find that the list runs somewhat boringly, but that's just how using venoms goes.
Your T1 anti-tank is what I'd call "meh." And your T2 anti-tank - it doesn't get much more threatening (even with the flyer). Having only two squads of suicide haywire wyches puts a huge target on them, and believe me, they'll die if your opponent wants to kill them. I'd run at least 4. My list runs 6.
I think having the one flyer is just fine. Its not my personal choice, but it's a good flavor pick.
I'd take the Night Spinner. You could use the Blast for light vehicles.
The Mantle on the Farseer is an optional flavor pick as well, because he'll survive just fine in the Beast pack. Your choice.
I'd suggest bringing at least 1 Grisley Trophy on a venom or two. You can reroll psychic checks on the Farseer with it, as well as rerolling any morale checks for your beast pack - which is pivotal. You do not want to run. Grisley Trophies are the poor mans Shard of Anaris. You can also roll on Telepathy for the Fearless power.
My 2 cents. Hope you find it useful.