Make sure your images are cropped with the 5:2 (Wide Carousel) option. The wideCarousel style will crop the contents of your Carousel's title/description area as well so be sure to use short titles ...

Carousel - CLF3 The new "Banner" display style of the Carousel component allows you to present a clear call-to-action for each slide in your carousel. The text can be aligned left or right, and can ...