I think I need overkill on the flower nails because the cakes are scratch and I tend to have recipes that are very moist. Without them , there is going to be a dfference between the edges and the middle.
For next time, you could get a set of the flat heating cores out there now. I'm sure they're at other places, but here's what they look like. They come in a set of 4 and are a bit thicker than the flower nail.