There are short guys and tall guys in wrestling. I trained with guys 5'8 to 6'9, 180 to 350lbs. Its all about getting a crowd response, good or bad. Be ready for headaches, if your not use to hitting a mat.
Its better to go by how you look I got different BF readings from different trainers. I started to go get dunked also, but just decided to go mostly by how I look. I do think your right about the ethnic part.
I came in at 200 lbs, I over dieted and didn't carb up in time. I was trying to come in at 215-220lbs. My weight just dropped the last two weeks before the show.