Tengu are weak to MYS, but yeah, Slash Dive sucks. I usually used Aya to run away from triple battles with them. Aya is great for Golden Massive Kedamas, for that matter, as they have no DEF/MND, so her (and ALL attacks in general) hurt them a lot, and Aya will get MANY moves in.
Kedama Goddesses pretty much scream "Have Kaguya use Swallow Cowrie Shell or run away". Even then, usually had to have a non-elemental multitarget (Little Legion wheee) as well. Any element other then Nature is resisted, if I remember right.
Basically, when doing that floor, I used Alice/Aya/Kaguya as much as possible. Last person was less important, often used Yuyuko or Rumia but anyone works. Literally anyone, since even your support characters will pack a heavy enough punch against Golden Massive Kedamas.