Man o man. . . I must really be doing something wrong. My YF egg hatched three years ago and it is VERY smooth, however, it's so tiny compared to yours:
And my tortoise partner, @Will , posted a picture of one of his Manouria babies that's twice the size of the one from the same clutch that I kept. I don't understand. I feed them well, they have heat and moisture. Can you share how you care for this YF tortoise?