I will apologize, I don' t have a lot of time to go over all of your stats as detailed as you might like.
Are you being realistic with your expectations on your bodyfat? A bodyfat% in the single digits is where triatheletes usually are at. Is that your goal? The ideal bodyfat% for a male is 15%, so you are below that. I am just posting this for you so that you can use it as a reality check.
Now, on to the belly fat...
We may typically gain fat in an uneven pattern (elevated insulin causes fat to be stored in the mid section). However, we lose fat in an even sweep. We are not able to target the specific areas that we want to lose it from. So, my assumption is that if you have been burning the fat at a fairly consistent rate, then you should continue to do so, and it will eventually come off. Think of some people that you have seen lose weight, we don't carry that much fat in our face, but the face seems to be the first place that you notice fat loss. In reality, the fat is coming off evenly throughout the body, but the areas with less to lose will appear more apparent. So, hang in there, if you have been successful thus far, I assume you will continue.
Your protein needs are dependent upon what you perceive to be your activity level. I don't know what you are entering for that factor. It could be possible that you need to increase your protein, and my intuition says that if you are "feeling" like you are working hard but not gaining any LBM, then perhaps you might need to increase it.
Now, here is a question for you... how have your stats changed over time since doing the Zone, in terms of bodyfat and LBM?