I hope I can explain this one. I have had problems with 9x13 cakes placing them on top of eachother even. I bake 2 9x13 and putting the 2nd one on top is a nightmare. I am always off a little bit and the cake looks lower on one side. I have taken it from the pan to a board and then sliding it off onto the bottom cake. It usually cracks while doing this or does not make it on evenly. Any suggestions?
Thanks 
Be sure that your cake is cool before placing it on top. Also, I make sure that the filling that I put on top of the first layer is level, if that is slightly off then the top layer will not lay right. I also level the cakes before I assemble them. Hope this helps!
I too have the same problems, actually with all of my cakes, with or without heating cores.... I just can't seem to get an even cake... I wish I could figure out some simple trick, but for the life of me can't..... I wish I knew a magic spell to make them PERFECT!
Another thing you could try with a big cake (learned from experience) is to freeze it...then when you want to decorate, thaw slightly (or at all) and then it will be easier to handle. Less breakage which is my problem.
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