Curved cocks are often excluded from official studies/measurements because of this big inner and outer measuring difference (and the difficulty of measuring).
You could do a flaccid stretch measurement instead which evens the playing field. My flaccid stretch length sits between the inner and outer curve measurement. Or you could measure how banana’s are officially measured: the outer (longer) curve. This is equally fair to both upwards and downward curved guys. No matter which way you flip a banana, upwards or downwards, it keeps the same dimensions, so the measuring should incorporate that. Which it doesn’t right now and that’s why it’s often excluded from studies.