That is a pretty drastic fit change.
I would imagine that much of a change would result in very noticeable body changes. I've only done one one pro fitting before. BH? It helped. If I remember right, a shorter reach and a slightly lower saddle were the main changes... They resulted in more hamstring engagement and more relaxed shoulders.
That was in 2008, and I have really only copied that fit ever since.
Maybe I'll do another one someday, maybe not.
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