Hmm I dunno angle from dangle on these things so I'm not much help in that respect, I sharpen by hand but possibly about the only person that does it the way I do it, I hold the stone in my left and the knife in my right and I basically strop the blade against the stone, going across the stone at about a 45 degree angle, tip to heel and then I flip the knife over and bring it back towards me, again tip to heel.
Some of these knives have some not so nice factory edges on them, my recent purchase wasn't as bad to sharpen as some other, but it still takes time to do it well.
G2