I've read that people should smoke what fit's their "look". I'm a big guy myself but don't really know that big guys should smoke big cigars. I just don't really like those little pencil sized cigars and like the "classic" fat cigar I guess.
I know what you mean, I'm a big guy too and I feel I look ridiculous smoking a cigar that doesnt "fit my look", however that doesnt stop me from trying different sizes.
Generally speaking, I prefer to smoke torpedos/pyramids which are about a 52-55 RG, but at the same time I have smoked and enjoyed very much the Tat Brown & Red labels which I believe are a 42 RG.