I'd like to see a vid of the glute/ham raises. Sorry dude but I find it hard to believe that you are so good at those already that you need to add weight. But seeing is believing
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What do you mean about the bulg. squats feeling weird?
On the neck thing I don't know how that maching works but if it involves actual neck movement back and forth I would avoid it like the plague. It can cause severe and permanent damage to the cervical spine and you know when I say these things I speak from sad experience. The best things for neck are more isometric in nature. It does not take a lot to make the muscles grow like crazy but it is so extremely easy to screw up and once you do you are looking at problems extending from the neck to the whole shoulder girdle.