Just Change to Earth Main.. His resistance Shield can help your ninjas survive the spider bombs

I defeated the instance at 16k
Karin X X
Guy Main X
Chiyo X X


Main Talents
Mystery - Earth style super lightened Boulder
Standard - Petrifying Jutsu
Passive 1 - Primary Lotus
Passive 2 - Pose of Duel
Passive 3 - Earth style Boulder Jutsu
Summon - Shark

Have Chiyo Resurrect The Earth Main
They give a good combo in addition to two standard attacks to take care of tobi.
Use Dynamic Entry on Deidara's Mystery.

I haven't tried the seal mission on the instance. Will update when i get the results.:)