There, happy? It's the build I use for *regular* Misty and I don't have to pay attention to Spiders at all, yes even up to wave 30. For Pure Strategy you could probably mess with the Gas and Darkness traps to get even more DU to cover whatever else you want.
I know this is hard to believe, but with a bit of time and thought it is actually possible to come up with a working strategy for something without having it handed to you! I'm sorry, but just because you can't handle something, that doesn't mean it's impossible.
Not to say they should be i