No disrespect Needs Help, Just a thought
Way back when, when I was first riding "more" my road bike would shimmy on any descent, practically any speed. Then I started riding a mortocycle and mountain biking and learned a lot about positioning on the bike and bike handling. The shimmy went away except for in the upper 40s which was faster than I cared to go downhill on a bicycle anyhow.
I'm not suggesting learning to ride a mortocycle, or taking up mountain biking, but perhaps spend an hour with a coach to see if its a technique issue? (questioning technique is always a delicate issue...)
Or have you done that already?
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Box? What box? There's a box?
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