Image Width Adjustment

I have galleries that contain both vertical and horizontal photos. The verticals look great and fill up to the top of the container, but the horizontals are being constrained to that same width and therefor look quite small.

Is there anyway to adjust the default width? I upgraded to the Bonus pack and set the number of images to 1, which has helped a bit, but would be great to be able to set the default width.

Thank you for your assistance.

https://ww.wp.xz.cn/plugins/wp-imageflow2/