I'm testing the usage of this plugin primarily for use in a tabbed widget, so I'm working with the manual insert of the php function codes. My theme Catalyst framework, has a php widget for such purposes.
I'm using Arconix Shortcodes for the tab and inserting the php function into the content area. This executes beautifully - I'm excited, because Arconix seems very "lightweight", meaning it doesn't seem to take a lot of load time. I see you're going for optimizing, too, so the two together would be a wonderful thing.
The interesting thing is, whenever I try to style Top 10 using the classes or ids, whether it's within the plugin's admin area or my theme's custom CSS area, there is a "flash" phenomenon introduced when the page loads, which results in a momentary display of the text "Tab 2" and "Tab 3" as the thing is loading, followed by the proper placement of the text, but no joy on the CSS.
I'm not seeing anything obvious in looking at the whole thing with Firebug.
This is the test site: http://grassrootsne.com/testsite2
The tabs test is a little way down the page to the left.
I'll leave the custom css in there so you can see that "flash" I'm talking about.