Sun Apr 22, 2012 6:36 am by lax
It is like this precisely because you are scaling the rendered display down to the size of the window. The only fix is to adjust the rendered display resolution to match the size of the window; then the text will be exactly the size it should be. If you want to run 4, one in each quadrant of your monitor, that means you chop your monitor's resolution in half each way for the game resolution. 1600x1200 monitor becomes 800x600 games.
The only other option would be to increase the font size in the game. I don't think this option is available