Arm wrestling is almost entirely technique. Most people don't arm wrestle anyone, and their technique will suck, but it seems like you arm wrestle most of the people you meet, which means you probably have developed some kind of useful technique even if you haven't explicitly studied it.

I'm 210#/6', My 5 rep maxes are(I don't do 1RMs): bench 275, DL 495, squat 455. You do seem strong, but I am pretty sure that is due to your genetics and whatever exercise you get, and not due to the red meat diet you have.