jross Hi. Yes I'm afraid it will be either repeating or showing a black bar if we will disable repeating option with:
.acm-slideshow .owl-carousel .item .bg-item{
background-repeat: no-repeat !important;
}
This is why it was designed to cut parts of the image, to avoid that. But maybe try to cut smaller part of the image with this style:
.acm-slideshow .owl-carousel .item .bg-item{
background-size: cover !important;
background-position: center center;
}