Here is a tip to get rid of that dome.....as soon as you take the cake out of the oven, take a damp paper towel and drape it over the cake. Take a slightly smaller pan or plate and place it on the paper towel. Apply gently even pressure on the cake for about 20-30 seconds. Just like that the dome will be gone. It must be done as soon as the cake it out of the oven or it won't work.
HTH,
Berta
I'm actually surprised when a cake comes out of the oven perfectly level and flat on top 
. I think the slight bump in the middle is common and pretty normal as long as everything else checks out okay...not overdone on the outside or anything. It's what cake levelers were made for...just trim it off. The squish method works to and I've used it with dense cakes but for light cakes that you want to be fluffy, I think it's better to level rather than squish.
Can you describe it a little more? What do you mean "bumpy"? Just rounded at the top or a lot of little bumps?
That's a really good question. A lot of little bumps could be air bubbles that rose to the surface. I've had that happen. I tap the pan on the counter a few times before baking to get the bubbles out.
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