Loving the Apple Watch, but I'm a bit worried I got a Gruber model. The haptics seem very weak and I'm alerted to notifications more by the sounds than by the Taptic Engine. I kind of feel them when I'm sitting down relaxing, but not at all while driving or walking... I don't have particularly tough, gnarled, work-grizzled wrists I expected I would be able to mute the watch while at work and still be aware of all my notifications through vibro-sense... Do I have a duff watch or are they all like this? How strong is the Taptic Engine supposed to be? Cheers, Steve.