I'd drop the Beastmasters and take some wyches with Haywire grenades in case he takes some vehicles. At this low of points though, I bet he won't take many vehicles. He is going to try and take an asston of firewarriors, in which case wyches will be great because he can't stand up to us in close combat. Maybe drop one of the ravagers for some more wyches or warriors, but definitely keep one.