That movement (post #15) works for me. I can get it to fail, but I have to actually try.
The problem here is that, you want the screen to come on when you look at it, but you don't want it coming on all the time and draining the battery.
There's no way they can make it selectively operate when you want it to, in a position that would be considered a natural movement and wouldn't normally warrant activating the display.
IMHO...they've done a damn good job with the activate on wrist raise feature, and if yours isn't working in many situations, then I'd recommend you take a trip to the Apple Store if possible, and compare it against their units.