I too started to re-consider my S4 sizing, as my reach feels too short. The S5 was an option, but the LBS said no, S4 is best for me, as the S5 is like an old XL size.
I’m 186 / 6’1, with a tall torso, and 32” inseam, but I too feel like I’m gonna go over the handle bars, unless I stay WAY back...