I have the same problem as Rick.
There are hollow patches on either side of my adams apple and the problem is that my beard grain grows back and up towards my ear, only in these two spots.
It’s as much a pain with a disposable as it is with a straight, so it was expected.
I'm actually doing a little better with the straight than with disposables, by pulling the skin halfway around the back of my head (slight exaggeration there, but it give you an idea of how much I have to "move things" around), and then pivoting the razor in my hand to create a slight against the grain sweep that catches about 90% of the stubble. But with or with out a straight I always miss some in this area.

Another area I’m having trouble with is just under my chin where you can press up and feel the mandible, for about 3" back down my neck. The stubble here is just tough as all hell and no matter how tight I pull the skin I cant get a close shave with out going directly against the grain and even then its hit and miss some times.