Run what feels good to you. It'll annoy all the rest of us . Do though, at least try a few runs on some lower pressures. Trails are smooth where I live too, and yet I can't think of anyone who runs 40 psi. I run 20 and 25 psi on my 2.25" 26er tires, and that's with tubes in them. Or maybe it's 15 and 20 psi. I forget. Whatever I have them at, I won't go lower due to tire squirm.

At the end of the day though, ride what you feel good about riding.