I'd like some advice on shaving my neck if anyone can help!

I usually wear a beard, so I am only shaving my neck and cheeks, and I only tend to shave once a week. The neck is really tricky. The grain goes from bottom to top, right up to the jawline, but on the sides of the neck just below the jawline the grain heads off towards the ears, so under the jawline at the sides the grain goes from the centre of the neck towards the ears. Also, the hairs on the neck lay very flat.

The first WTG pass, from bottom to top, is never very smooth, I guess because the hairs lie so flat. XTG is very tricky, so I don't manage to cover much, and for most of the neck the second pass is ATG, starting under the jawline and shaving downwards. Because there is lots of longish stubble lying against the skin, this is really tricky, and the razor jumps and catches, though I have never cut myself. I tend to shave downwards in very small strips, about 1/4" wide, especially around the adam's apple. On the sections under the jawline towards the ears, I can neither do a WTG or ATG pass, upwards or downwards is XTG.

Any tips or suggestions? I have a couple of older heavier smiling razors, and they perform MUCH better on the neck shave than a lighter blade.