I am not sure that I would explain that lovely analytic tool "the parallelogram of force" correctly but I know that an on-line google or a trip to your library or a chat with any high school science teacher, civil engineer or whatever, will reveal how you can use it to look at the stay loadings. Once you do that exercise, you will understand that the bobstay loading is so much more than the jib stay, and the back stay loading is less than the jib stay and the gobline loading is less than the bobstay but far more than then back stay.
In a "perfect world" one could make the bow sprit and boomkin about as rigid as the hull and, given sufficiently strong bobstays and goblines, you could tune an old schooner the same way you'd tune a Farr's. That's not going to happen.
Sag, bend and jib luff hollow are beautiful things.
G'luck
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