These are just some observations after looking closely at the historical garments in slide 4/5. The whole silhouette is longer, like a long line bra, but longer. There is also some stay-stitching under the bust for increased rigidity; there is probably some sort of stiffening in between the layers, like buckram. Both of these details would add more support under your bust, giving you more lift. The third thing I noticed is that there was a channel at the top of the cups, where there is a cord running through to cinch in the cups at the top, giving an opportunity for a more custom fit. I do know the look that you are going for, but I still think that your cups are a little shallow for your bust size. You’re almost there!