Yeah, Wulax, just wulax... I mean relax.
Like Orpheus said, you're supposed to get a layer of sediment in the bottom of each bottle.
Siphoning the beer on top of the priming sugar will cause enough motion in the bucket to mix the sugar throughout. Don't think about changing your procedures until you are sure that they didn't work. I have used the same method on all of my beers and I haven't had any bottles be over or under-carbonated.