However, I had my LBS install the seat originally along with a slew of other parts, and it slipped then as well. IOne would assume they tightened to proper torque, esp. b/c they are Specialized dealer and handle plenty of Romin installations.
You should become a late night comedian, if you're not already. That is hilarious. What do you think the odds are that any given mechanic at an LBS which is a Specialized bicycle dealer, uses a torque wrench when installing or adjusting a saddle? The "mechanic" might even be a salesperson, since installing or adjusting a saddle is considered to be simple enough for anyone to do. There are some rather appalling practices at many LBS's, even at those whose lowest end bikes are much higher end than the lowest end Specialized bikes.
Go to an LBS and watch what the mechanics, no less the salespeople, do in full view of the customers. What do you think they do when there's no one watching? And of course, use of a torque wrench per se is rather meaningless if not associated with some particular torque, which is the "right", or at least a good, torque value.