Scaling font in UIScreen

How come that when I resize my text, that it becomes all wrongly drawn? I have seen other mods using smaller fonts with smooth letters (e.g. Mariculture), how do they do it?

        int x = screen.width / 2 + 10;
        float size = 0.8F;
        GL11.glPushMatrix();
GL11.glScalef(size, size, size);
x = (int) ((x*1F) / size);
fontRenderer.drawString("Spawning blocks: ", x , 34 + line*10, 0x666666);
GL11.glPopMatrix();

        fontRenderer.drawString("Spawning blocks: ", screen.width / 2 + 10 , 34 + line*10, 0x666666);

P.S.: BBCode Editor seems broken in Chrome: Uncaught TypeError: Cannot read property 'handleButtonClick' of undefined index.php?action=post;board=73.0:1