Originally Posted by JohnDThompson

How much torque are you putting on the bolts? Unlike a single-bolt post, you don't need a huge amount of torque to hold the saddle in place. In fact, too much torque increases the static load on the bolts, making it more likely that a dynamic load (i.e. pothole) will increase the load beyond the point the bolt can handle.

N.B. I haven't used Velo-Orange's post, just two-bolt posts from Campagnolo, Zeus, and Sakae Ringyo.