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In answer to the OP, I've recently tried the Specialized RBX Comp short, and while I think I would have preferred the longer short over the shorty (sausage legs), I like how the chamois fits.

125 lbs at 5'3" is plenty small! I'm two inches shorter, and to be honest, I'm built such that 125 is probably as small as I should ever go. I feel miserable when lighter.