The load is spread over a large area, and using a band has made the spreader load land on double the thickness of material and more than quadruple the spreader cross section surface area.
Spreaders should not move, any movement would in itself, cause fatigue and wear. Many carbon rigs have the mast and spreaders etc glued n glassed. No movement there.
Possibly the 'deflection resulting in flex inducing fatigue' in you post, is an opinion from a bygone day.
Regards
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