Brian, I LOVE this plugin and recommend it to my clients. I found that a 24px icon size worked best on my site. I changed one little line of code in the plugin file to set that as an option and to find the new folder labeled 24 that I uploaded to the default folder. Works great.
I re-sized all of the 32px default icons to 24px and have them available if you would like to check them out. If they are acceptable, I'll be happy to re-size the other packs to 24px for you, if you would like to add this size to the next version of the plugin.
I appreciate all of the work it takes to maintain a free plugin and happy to help make it even better.