Yeah, 14px looks bad and the longer names will be cut off.
Why don’t you style “Flagged as spam by Akismet” like “| In reply to someone” – next to the comment date, with the same “|” separator and without the grayish span. And, of course, drop .author strong font-size to 11px (as the default size is).
The 14px style for the commenter’s name looks awful IMO. I really hope this gets reconsidered.
Having a “Cleared by Akismet” link on each comment isn’t particularly helpful either. We know they’ve been cleared by Akismet – that’s why we can see them. It would be far more helpful to keep “Flagged as spam by Akismet” on messages that get filtered, and leave the rest alone.
That said, ones that are flagged as spam get put into the spam bin anyway, so I don’t know why any kind of badging is necessary. It’s needless clutter. Did some UI designer have a bit too much time on his/her hands?