Default [Q] Problem with curved text

Hi!

I'm trying to have text that hugs the outside of a circle. Now if the text string is long it pulls away from the curve of the circle and if the string is short it curves right into the circle.

I'd like to have it just ride the outside of the circle no matter if it's 10 characters or 100.

Anybody have an idea how this is done?

Many thanks in advanced!