resulting in a denser or uneven rise." It's the same effect, unfortunately, as using too little leavening agent (which is one of many cake baking mistakes that can and should be avoided), and as ...

Cakes that bake at a high temperature are more inclined to rise unevenly, as their quick cooking time does not allow for an ...

This will result in an uneven rise and a tough cake. You can, however, substitute plain flour for self-raising by adding sufficient raising agents.