Hey I am exactly the same height and weight and pant size as you and I wear a medium in the Tacks 7092 girdle. It is the best fitting girdle I have ever worn and is perfect length / still have plenty of room for adjustment in the waist if I were to to put on extra weight as well as plenty of extra room if I were to lose weight and needed to tighten the belt system up. I know this is not the girdle you are looking at, but I believe i have seen that the jetspeed and tacks girdle will be very similar in their fit and sizing.