Its funny your mention the "On feel alone" part.... I've been riding for quite a while and had never had a fitting until the WS one before Christmas. I thought, yep.. I'll get this fitting and BAM, I'll be faster than anyone. Well... In reality that didn't happen. My "old" bike measurements were very close to the new bike. I mean almost down to the cm in seat ht and stem+top tube length.. They did give me wider bars, but I felt all along I could go wider.. Now granted everyone isn't the same, and maybe I just was lucky with the fit of my old bike.. You are going to know how your bike feels. Get what feels good and doesn't cause you discomfort.

good day-
Jim Bonnet