I have a left axis deviation which was discovered just prior to my joining the RAF 24 years ago. I was required to undergo some further tests at the RAF Central Medical Establishment and subsequently joined as aircrew with no further problems.
13 years ago I left to undertake a CAP 509 CPL/IR Course and obtained a Class 1 with no problems and no restrictions at all and have never had any problems with renewing my Class 1 (touch wood).
I too am 6'5" and very flat chested (male!!!)