Priority issue

This plugin is great but it keeps messing up priorities of my snippets every time I change some snippet. I have 4 snippets and I want my “theme” snippet always go last so I set it’s priority to 300. It’s 10, 20, 30, 300. But if I change last one, it sets priority to 310. And if I change something in the middle after that, it sets priority to 320 (after “theme”). This just won’t do.