Hi,
I also don't get along with that :-)
It's mostly because of spaces between paragraphs, I bet, isn't it ?
That's why when I make an interview with an artist, I ask for the answers to be written on the reply.
Now, if you toggle from Compose to HTML on your post window you'll see the <p>s. Each one is a space between lines. Remove until you get one one.
Try writing your post with HTML on.
I don't like doing this, but sometimes I have to.
Kind regards,
José