The last one I thought that could hang was Joey Davis. The year he went and won it at 184lbs he got beat by an Alex Dieringer that won 165lb title in that season in a 180lb catchweight.
Joey was a four timer at 165, 174, 174 and 184 respectively from 2012-13 to 2015-16 and lost 9-0. While he did put up good defense, he didn't really have anything for offense.
I have read different sources that say it was 180lbs and 175lbs so I am not sure which one to believe. It was Freestyle, too, and not Folk.