I use a similar build, but was considering throwing Tanya's Love Letter in so I don't have to use Writhing Tendrils, which is a DPS loss both because of the damage of the attack and because of the fact in uses ichor, which Venom is often starved of. Replacing Writhing Tendrils with Infect and switching the Tier 1 talent to We Are Consuming may result in a DPS increase while also reducing the need to Dark Tendril weave.