Totally understand what you mean. I love men that are taller, or shorter than. I found one guy out here in Central MA last week, 5'5, 135, 26, toned, and trimmed hair. He was submissive and fun to toss around in the sack. Very sweet guy. Didn't find him on RM though, backpage win! Have you looked at other venues outside RM?
Take a quick trip to Montréal and look up Sam Kinky