The one instance i can think of where split backstays are required in in applications just like mine: a relatively narrow double-ended boat with a well-raked sternpost and outboard rudder/tiller.
To keep the horizontal compression loads between the two lower chainplates to a minimum, i would guess one ought to keep the athwartships angle of the lower legs as low as possible. Weight aloft does not particularly concern me, but having the plate close enough to readily access from deck while underway does.
As for the little gaffer... it's hard for me to take pictures of myself sailing! Great fun, b ut a handful indeed. Others keep taking pics of me, and several have promised to email me copies; so far, nothing in my inbox...
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