Hmm actually I was just wondering if there's a way to keep post-count titles without them applying to administrators (so that normal members go Newbie > Techy > Expert > Wiz but admins always just say Admin), but within your solution I've found a fix for this.
I added an additional membergroup - not post count based, called Forum Staff and I just applied that to Admin and Mod ranks as well so on their posts it says "Administrator" and below that it says "Forum Staff"... slightly redundant but better than the admins being called newbies and members hah. So the additional membergroup overrides the post-count titles which is good news.
Thanks