The thing that I would be wary about would be that depending on the size of the BC not only does it fit you differently, but the lift capacity of the BC changes with the different sizes. While I don’t think there is a problem with your solution in a short time frame, in the long run you want to definitely try and lose whatever weight you gained or purchase a new BC that’s the proper size. You may need the lift one day, and you may not have it.