Or at least be very close to it. There is not enough space to seperate the text from eachother. The easiest way to give it some room to breathe, is to add a narrow empty column between them. The narrow bar will be 25 pixels wide and the text bar gets smaller again. Still wide enough, but quite close to the desired line length of 15 words max.
Some browsers tend to collapse empty cells.
So there needs to be something in it, preferably invisible. By now the page already has a shape quite similar to this site. One thing is still missing. Tables have a default cell spacing and padding. So adding up all numbers plus the spacing and padding, you would go overboard on 575.