Keep in mind..every communication you have with your Admissions Officer and BGO is an opportunity for him/her to evaluate you and create an opinion or mental image of you. I am not suggesting that you don't contact Admissions/BGO with questions, but you should try to avoid questions that you could have answered yourself by reading the USNA website or other official sources. In addition , you don't want to appear "needy" or "insecure", pestering them repetitive questions or "how am I doing", "when will I hear" etc. Supplementing your application is fine, but try to keep it limited to material factors.
Your Regional Coordinator has thousands of applicants, and probably hundreds of emails a day, your BGO has fewer applicants, but also has a real job (and many deal with 100's of emails) so response rates may vary, and may depend upon how important/relevant they deem the inquiry or if they have spend time to determine the answer to your inquiry.
I am not in anyway discouraging anyone from contacting Admissions or your BGO. Just keep in mind that every communication is a reflection of you....as stated above, keep it clear, concise, polite, professional.....and relevant.