Line Spacing - Pixel fonts

Asked this in my other thread but thought it would be best to ask it in a separate thread.

Am I correct in saying that pixel fonts always need to be on whole x and y values? If I have a large paragraph of text using a pixel font, where the first line of text sits on whole x and y values so that the text doesn’t become blurry, however as the paragraph continues the lines of text gradually become blurry.

I would like to have a five pixel line spacing however flash only seems to be able to do it in points so that the text gradually becomes blurry when in paragraphs. What can I do to stop this? I am missing something really simple?

Here’s an image so you know what I mean. http://img107.imageshack.us/img107/6747/16lh1.gif

Thanks