I have a 2013 Specialized Roubaix with the original 23mm Specialized Espoir Sport tires (whose performance seems to be fine, but they seem fairly susceptible to small cuts from road debris) mounted on the original DT Axis 1.0 wheels. I previously rode Continental GP4000S tires on my old road bike, and was happy with the performance and durability, so am thinking of getting the same for the Roubaix now that the old tires are getting a bit cut up. I understand tires other than the GP4000S may be a little more aerodynamic or have slightly lower rolling resistance, at some trade-off to durability and/or additional cost, but I'm not sure those trade-offs make sense in my case.

What I am wondering is whether I'd be better served with 25mm tires. I understand they'd be slightly heavier and slightly less aerodynamic, but also have lower rolling resistance, better shock absorption (I ride on some pretty rough chip/seal roads with some pretty significant cracking at times), both as a function of their larger size and because they'd allow me to run lower tire pressure without risking pinch flats. I'm assuming I could slap 25mm tires on my current wheels without issue (please correct if that's mistaken).

Relatedly, I'm 168 lbs, suggestions on inflation pressure also welcome. I used to assume maxing out to 120 psi was a good thing, have recently seen the light and been running 100, so far without issue, and it does seem to improve comfort a bit. I can't tell whether it makes me faster, but my perception is perhaps a little (and logically it should).