Well since then I've figured out how to get along with my mixer, so I decided to have another go at it. I followed the recipe meticulously, I had all my ingredients at room temperature, my baking powder has not expired, and I used 2 flower nails in each of my two pans. I baked one in my regular oven and the other in my convection oven. The one in the oven still has the sad streaks albeit a little better than the last time and the one baked in the convection oven (microwave size) did better but still has some streaking. Both rose well in the middle but not as well on the sides. My oven may be running a little to hot, I'll have to get it checked but I think my convection oven is fine. I have made cupcakes using this recipe and they turned out fine.
I've attached a picture so you can see the problem. The cake on the left is the one from the oven and the one on the right is from the convection. The only thing I can think of at this point is that the pan is too large for the oven, or the oven is too wacky. Any thoughts or suggestions are greatly appreciated. I'm making a three tier wedding cake in June for a friend, and really need to figure this out!