I have the same problem with my neck. I do what I think Steve does only I go the other direction, i.e. take a look at his referenced diagram. My arrows would point back to the heal instead of forward from the toe. North to South labeling is clear to me, but the East, West labels are ambiguous, so... I do an against the grain keeping my razor essentially level and shaving down while at the same time going slowly from ear to throat (cause my neck wiskers seem to grow from throat to ear). Now I do this as a second pass and VERY CAREFULLY. I still don't get real BBS, but it's the closest I can do and is good enough for me.