The best way to rebutt a C&P exam is to get your own IOM/IME. For many years I depended (stupidly) on C&P exams to get increases. I have many C&P exams over the years. They are full of mistakes, prejudicial statements, lies, and pure BS. When I got real medical reports from IMO doctors who knew how to write a report I jumped from 30% to 70% within a year. I had been at 10% for 20 years even with much evidence of symptoms that supported a 30-50% rating. When I got 30% I should have got 50%. When I got 70% I should have gotten 100%. The VA consistently low balled me. Now I have 90% TDIU. It only took 30 years.