WordPress Post Date Changes On Update

Answer 1

I run the same permalink settings and don't have trouble with post updates changing the permalink. There are separate editor settings for the permalink and a user has to specifically change the permalink from that editor, which is right under the post title in the text editing box in the post editor. That's a WP thing to keep permalinks from getting broken all the time.

Maybe you should try using a few static pages? That way you can have both a clean permalink: mysite.com/mypermalink/ that won't change, if in fact your post permalinks are changing from a plugin that you need to use.