I am in the same boat with a Ride board. I am 5'9 and 195 pounds the board I am looking at is a 156 which states from Ride it is for riders 125lbs-175lbs. Obviously I am out of that range. I would t worry too much. I know I did but after talking with some on the forum Ive learned that the board will most likely just flex slightly softer than stated.
This is the only purpose of weight "limits," to give a better idea of flex. You're a little on the shorter side so I'd say go with the 157.