Did barefoot work better? One of my teachers had that issue of leg length. She had shoes similar to this but her issue was more profound a good 8-10 inches:
My DD college dorm room mate-in high school had her arms and legs fitted with metal contraptions that continually broke her limbs, when they would heal they'd turn the screws and break them again to lengthen and strengthen them.
She had these on her arms and legs. Her last semester senior year her PE Class a teacher took her one on one each day and taught her to walk up stairs, something she had never done before. She walked up the stairs and across the stage at high school graduation with her PE teacher by her side. Now that huge campus of the University of Illinois was a real issue for her the first year they were down there for the young lady.