I actually use a single wand and a shield because my dmg can run juiced t15 and t16 without the need for more dmg.
You should be able to pick up almost all the dmg you need from your skill tree if running oracle druid. Just take all spell and physical dmg modifiers. I also nabbed a lot of duration nodes to counteract the duration reductions you get from the tree. I also grabbed a lot of mana regen. With so much +increase to damage the add extra as dmg seems to go really far, so don’t shy from taking the add extra as chaos from the oracle added nodes or similar from your wand. You also don’t need the physical support that conflicts against that.
Use CoC on crushing vines.
Manually cast entangle and tstorm.
I use pin on entangle too, but use very basic support. Extra fissures, faster cast, pin
You will still be melting bosses at t15 and t16 maps