Blogger is frustrating me

I don't get why line breaks in the HTML in Edit HTML mode causes some huge gaps in the post - is it HTML or is it not? Also why isn't the Preview a proper preview? The CSS and post rendering are totally different.

There are a lot of other frustrating things about Blogger right now but just fixing those two items would make me a lot happier.

I'm trying a new theme template to see if things get any better. Looks like the answer is no so far.