Another thing that has me excited are the big flat feet. This is a very archaic condition. Not having the specialty bone needed to create an arch left it with a big chimp foot.
I found the Nature article on the analysis of H.floresiensis feet being hosted on the institution website of one of the authors. Although H.floresiensis feet are indeed large compared to modern humans, the relative proportions of the feet are comparable to bonobos, which are smaller than the common chimpanzee. While your earlier comparison of the size of feet being akin to 'skin diving fins' was as you say an exaggeration, it would appear to be misleading.