I have the identical Break Away, 54 I believe, same color scheme, stock Ritchey fork and HS. I've never had an issue on descents, guessing I've hit 35 - 40 plenty of times. Speed wobbles are maddening, not to mention scary as hell. I had a Cervelo RS, early model, that went into a speed wobble at 45, thought I was going to be scrapped off the pavement. Sold it, couldn't ride it with confidence.
I have no suggestions for you. My only comment is that I have the same bike and haven't had any issues.
Good luck and if you solve it, please post
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