Man I would think the AM kit is WAY to big for you, not that you would be too short your height is ok but I am 5'9" and I had to cut quite a bit off the top of the thighs and off the bottom of the shins then reform the return edges. Plus the AM kit is made to fit larger framed troopers and at 127lbs you are pencil thin. the chest and back are going to swallow you whole. the forearms are long as well. My suggestion would be being that you are thin enough and the perfect height for a real movie size trooper then dont get the AM get a screen derived kit like TE2,AP or other.
NOTE: I have an AM kit and I love it so I am not bashing the kit, It's what I could wear based on my size.