I too had the issue with the sinking, but not on 9" layers, 6" layers. I've since adjusted the baking powder, depending on the size pans. Rose Beranbaum (Cake Bible) says if cakes dome, increase the leavening to weaken the structure of the cake. So if the cake sinks, decrease the leavening. Here's the link to the blog post on this subject: http://www.realbakingwithrose.com/2006/06/why_cakes_dome.html I use the time as a guide and bake until a toothpick comes out clean.

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