Try this:

• UDK - 300 RES, otherwise just make him as tanky as possible
• Kimi
• Sethallia
• 2x CH

My observations:

1) Level Akoth to 60, Mastery, and move to Lead.  MM Aura does nothing to help you here

2) Replace Drexthar with Geo.

3) replace MM with UDK, Superhigh HP and RES, preferably in a Double Stone Skin (slow) or a Guardian Set

This should allow you to chip away at the spider mama with HP burns, keep her TM down with Alure, Coldheart and Scyl, UDK keeps the team alive, Scyl stuns the spiderlings and heals and revives UDK.

I missed the second CH on first look, probably work better than Geo