I have figured out on how to reduce the font size for tables. It has been bothering me when editing my main blog where it would appear correctly in the preview, but not on the actual one even after saving the changes as though I never entered it. In case you were wondering what exactly, it's "Anime watch list", "New anime" and "NewType Anime Rankings (June 2008)".
At first, it was something like:
[span style="font-size:80%;"][table]..........[/table][/span]
But it worked properly when I changed that to just:
[table style="font-size:80%;"]..........[/table]
(due to formatting issues, the regular angular brackets had to be replaced with square brackets)