They all have DRM, so far as I know, but I believe they're pretty much all full justified. You're not the first to have a problem with the font size, either. It varies a bit from book to book but they all seem to be at least a bit on the small side.
Whatever you do, please do report it to the ConnStore folks, the more people who complain, the more likely it becomes that they might actually do something about it.
