Fred's right, hybridizers are responsible for the registration of their daylilies. A percentage box does not guarantee a daylily is correctly registered or will even perform at the registered percent for that form in your garden. There is no set requirement for a certain percentage of sculpted form blooms per scape, just as there is no set percentage requirement for blooms per scape with any other form. What is being measured by a percentage is consistency of form, not whether it is or isn’t a form, form is chosen by a hybridizer. Consistency is something hybridizers of all daylilies struggle with, not only in form, but other traits as well – opening, teeth, pattern, bloom size, color, etc. There are many factors that can have an effect on consistency.
I didn't want to spoil all the fun of researching sculpted forms,
just give a place to start for those that might be interested. I've seen some images of Moon Over Monteray showing relief and I believe Dan Hansen has used it in some of his relief forms. Lavender Blue Baby is in the background of several cristates, Texas Feathered Fancy, Michael's Sword, Greetings Earthing...Tet LBB could possibly be useful as well. Finding which cultivars can produce sculpted forms should help us in the quest for improving consistency....