I'll come back later with some comments about the content. Now - the white patches ... do you mean the empty space between paragraphs?

Cause that is perfectly fine, it helps with online reading.

However, I do see some skipping back and forth between font sizes. May I ask from which program you copy and paste? And do you use the WYSIWYG editor in lj or the html editor? I might have a suggestion how you will end up with cleaner code depending on what you're doing.