Hi,
There is not really an option for that, but it might be possible with some custom CSS rules:
[html].item.asp_isotopic_item {
height: 280px !important;
}
.item .asp_item_overlay_img,
.item .asp_item_img,
.item .asp_item_overlay, .item .asp_item_overlay_m {
height: 70% !important;
}[/html]
You will have to adjust the 280px and the 70% for lower/higher values, but at some point the gap between the image and the text should get big enough.