+1Here is a thread loaded with good tips. Hope this helps!
The Neck Area Shaving Info Thread : post tips, suggestions that would help others.
+1 on the 6.@Fakman87 Aside from what everyone has said about angle, I noticed that you said 2 ATG passes. I have learned that the neck area is prone to growing many different ways, so 2 passes can possibly equal like 30% of ATG. The area that you still feel stubble, I would re-lather and go over it in 6 different directions, in order to hit it every which way.