Tystie's halyard is attached to a span of 6mm Dyneema (very strong and resistant to stretch and chafe), which is tied around the yard at points one-third and two-thirds from the bottom.
Yesterday, I shortened up the upper leg of the span such that the halyard block, if it had been attached directly to the yard, would have been at a point 60% from the bottom.
Today, when I made sail, I found it very much easier to trim the throat parrel, seemingly not in direct proportion to the increase in leverage, but better than that. I wonder why that is? Could it be due to more of the leech tension being transmitted directly to the halyard?
I suspect that any high peaked sail (such as those on Malliemac, Footprints and Fantail) might benefit from a higher halyard attachment point - if the mast is long enough, of course.