I have never really done anything special, that is what I love about visibletweets. I have always used it on vertical monitors though at 1920x1080 so maybe that is saving me. I also like it because I can use advanced search criteria like from:@user. This would give me only tweets and re-tweets from that user. Almost kind of a poor mans moderated twitter feed because it will not include others tweets mentioning the user.
What kind of device and resolution are you trying to use visabletweets on?