Looking at your picture of WF3 laying on top of the fillet base, I didn't see what WF1 or WF2 looks like. Are they all triangle in shape? If so, then Adrian must have modified his plans to give the fillets a more scale like shape. My kit came with precut pieces for WF1-3. They were all shaped to fit flush with the fuse, flat on the bottom to lay against the fillet base, and concave on the top.
Mike