When getting parts for building out an old Paramount road frame, I bought some 42cm Cinelli 64 Giro D'Italia Alloy Handlebars.

My previous bike I've been riding for over five years had 38cm Cinelli Giro D'Italia on it. I'm wondering if I made a mistake going wide as I now am using STI shifters and riding on the hoods and drops more than the tops closer to center as I did with the previous bike.

Does width play a part in why I feel a little more straight armed as other aspects of fitting? I've also got a 100mm stem on it. Think I need to shorten that.

Thoughts anyone?