Monkeynutz...............exactly the same situation for me i.e tall (6'4") second row man and BMI at 29. When I got my current job ( UK based ) the company doc wanted to see me after he had assesed my medical info. Upon disrobing in his office he muttered something along the lines of "Ah, that exlains that" and did a quick poke n prod and signed me off as ok to start.
My current AME simply wrote something about athletic/muscular build on my notes and I've never had any problems or questions about my BMI