That being said, it is far more likely that your measurements are not accurate. I've never heard of a sail maker making a 160% (or 162%) genoa. 150% is the common measurement, with 155% allowed as the max to account for stretch and variations. It is easy to be slightly off when you measure the 90 degree angle at the luff to get the accurate LP measurement. Something more obvious, like a 170% (which are occasionally made) might be more apparent. I would bet money you have a 155%.
jg - fairly new fella here, but I don't know that I can agree with you on this one.
I have a C&C 35MK1, and the 'standard' No 1. Genoa used for racing these boats is 167% (if not cut for roller furling).
My 167% was subsequently cut down to 155%, and my stock #2 150% was cut down to 135%.
I think it's maybe narrow-minded to suggest to someone that just because you've never heard of it, it doesn't exist, and instead imply that the OP can't measure....?