I've noticed your preference for unsleeved lines. Do you notice any increased tendency for lines to break at those unsleeved knots? What I read about spectra/dyneema says that the strength goes way down in tight bends, and sleeving helps alleviate that.
I never trust anything I "hear", so my own personal experiences are the only guides. I haven't ever broken an unsleeved line set anywhere near the knots in all my years of quad-line flight. I use a figure-of-eight knot whenever possible for self-made line sets or bridle construction. At the thickest point or center of the knot it is four strands and an added bonus: this knot tightens in both directions. If you can "place" it correctly, it is impossible for further movement!
For line sets you'll make a longish loop, so if and when your need equalizing, you can just insert another doubled-overhand (less length used) or figure-of-eight knot (more) into that longest strand.
I'm constantly fiddling with tuning, so the line loops are eventually full of little tiny knots. When the spectra isn't slippery enough anymore I buy new lines. The older sets get cut down progressively shorter (as they gracefully age) until they are finally discarded or tuning into magic stick truss lines.
Everything wears out at about the same time for me. Low wind kites last me a couple of seasons (max is 3 years for intensely abused) High wind kites can go strong for a decade or more. I'd say routinely I get a couple thousand hours (2-3) of pleasure before it's time for replacement on the sails. Line-sets? A couple times every year I'll buy new 120s, LPG when it's easy, Skybond when it's easy. Both lines are great if different. One is like flying on kinda' slippery wires, the other is more forgiving with flex but EASILY twice as slippery.
I only fly sleeved lines if they came that way, It's not my preference but I am certainly a lazy kite flier.
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