In addition to the above, I might adjust the leading to be closer together (the verticle space between each line or in this case each letter). In the Text Toolbar at the top of the Xara window, the last tool on the far right is space adjustment, and the 2nd adjustment "space after paragraph" is what you adjust the leading space with. The default leading is fine for horizontal text, however as verticle text the leading space might be too far apart, which is why I would adjust the leading space.