If you’re images are large enough, or if you can make them large enough they can definitely be centered. I’m pretty confident I can help you do this with the Genesis Slider unless you would rather not use it due to it’s limitations. If you don’t want to use it, and you’re looking for something with more options/layers and everything you need to do what you’re referring to (text on top of a background) you should try something like the Layer Slider in this theme – http://demo.appfinite.net/ally/ …Do you like that slider? Of course you don’t have to add in all of the fancy sliding features that I have, you can still just have it show a basic slide with a background image and text on top if you want. Just let me know