It would be helpful to know how wide your shoulders are. I do not know if a)You have been riding with too narrow handlebars for the last five years, or b) you just bought too wide a handlebar. I am endomorphic (small framed). When it comes to Cinelli handlebars (been riding with them off and on for over 40 years now) I only have ever used/ considered the 38cm width (I have always preferred the slightly deeper drop mod. 63 ). It should only make the slightest difference in reach with the wider bars. I cannot imagine that it should perceptible.