Customizing raft height

Hello,
I find that when I print with HIPS the first layers of my model gets fused. I use the default cura settings for HIPS (Village Plastics). I would like to raise the height of the raft so that the model is not so close to the heated bed. How do I go about raising the raft height? Attached is an image for the raft settings for HIPS.
RaftSettings.jpg