Hello all, I have a question pertaining to sizing on Abena M4's and S4's. I know the S4s are cloth backed now but I still am wondering about the sizes. I have a 30"-31" waist, and I am wondering do I go with the S4's because they are on the high end of the spectrum, or do I go with M4's on the low end. Plastic/Cloth doesn't bother me so am only going on what size is best here. Help appreciated!