I had a fit a few years ago where the fitter reduced my reach by 30mm. Frankly, I don't notice any improvement whatsoever in performance or endurance. Probably I'm a little less aero. He had me change out everything up front, so I don't see the value in going back either, too much fussing for too tiny an outcome. I'm just saying that 10mm more reach? Eh, unnoticeable after a couple days. More reach is good for you.
__________________
Results matter