I never undone bolts with it and not as a hammer.  I take my time, I will set it to what I need to torque too, put it down, pick up when ready, torque and then back all the way down.  Snap-On only goes down to 1.5ft/lbs, no zero, so I back it down all the way to that level.  Torquing a head, I use a half inch rachet to turn the nut or bolt partially loose and then pull with the torque wrench again.