If I understand correctly, the issue only presents when you export using the device browser. The project is probably being set to full screen scale letterbox and ends up on the left hand side of the screen, correct?
One thing that I saw that resolved this was to either wrap the canvas tag in center tags or set the style so its centered.
As for fonts under DC, I'll find out from our DC devs when that will be supported. In the mean time, you best best is to use image fonts. (not static images, but where you use images of the letters in place of text). This way you can still generate dynamic sentences but using images instead. I have not checked if there is a C2 plugin for them or not, but Let me know what you find. Again I will get back to you once I find out more.