Yes, I am shocked to see how low Mal's boom was on that sail! He still has that sail. We actually tried it again in about 2005/6 and I was blown away by how far ahead of it's time it was. It was set on a soft, short carbon mast which was also unusual at the time. He modified the sail himself by cutting out a section of the head above the top batten to induce more twist, and it worked beautifully. It was originally a 4m or 3.9m Proto. sail so it ended up being a 3.8m.
When he got back into speed sailing in the mid 2000's, he was rigging his booms at about the same height as I was, but he is 8" taller than me!!
Here we were sailing on an easterly at Sandy in 2006. Me on 5m, Mal on 5.8m. Boom height virtually the same. When I used his rig the boom height was fine but the harness lines were so long I could only reach the boom with my fingertips!