[NextGEN Gallery] Overriding basic styling

I’m having a nightmare with NextGEN gallery.

This part of their documentation states that you can use a custom stylesheet:

http://www.nextgen-gallery.com/templates/

So I followed the instructions given and have successfully created a new stylesheet, which I can now see in my Gallery Options through the dashboard. I’ve selected to use this new stylesheet.

However, some of the changes I want to make are not getting through because the basic custom styling for the NextGEN gallery has !important chucked on the end of every statement. So when I use this new stylesheet I’ve created, it just gets overwritten by the !important styles from the plugin.

What’s the point in adding this option to custom-style if everything gets overwritten anyway?!