What size Nike Pro shorts?

What is your height/weight and what size Nike Pro's do you wear? I am 5'4" and 127lbs and bought 2 pairs of mediums and I can't walk up a flight of stairs without these things inching up and it drives me crazy because everyone talked about how awesome they are and how they don't move when you workout. I am thinking maybe mine are too big and that's the problem?? Thanks!