[Help] There we go again.. ToA 89N, need tips. 2 Dark WWs + 1 Dark Yeti

So here is my box: http://i.imgur.com/xMlUjAX.jpg

I'm stucked here, where that WW's passive hurts a lot and my Belladeon falls under their claws.

I may be able to work on 1-2 6*, I was thinking about Fedora due to his 3rd skill or.. I just don't know. Every crit I land is so painful in this boss stage.

Thanks in advice.