Upgraded 2D game to Unity 5, saved by batching 0 and tris and verts increased

I have a 2D game with simple shaders. I used to have about 20-30 draw calls and 30-50 saved by batching, since upgrading to Unity 5.4.0b12 (64-bit) I have 0 saved by batching, 50-60 setpass calls and twice the verts and tris I had before. Is this because of some default settings I should change? I can't work out what would be causing this.