iOS GUIText size issue

Hello everyone, I need your help ! I am facing an issue when I build and run my Unity project in XCode : my GUIText objects aren't at the size I wanted. I have looked on google and found a post from 2011 speaking about dynamic fonts. I did everything : import multiple TTF with a size for each, and use it for the correspondant GUIText, with "0" in size for default. However I still have small labels when I run Xcode :/ When I set the size of the font to 100 in unity, I get decent size in Xcode, maybe it has something to do with the resolution?

Thanks in advance !

Julien