Changing title font between home page and single post

The titles of my posts are in a different font weight on my main page, compared to single post pages. I would like the font on my single post page to be the same as my main page. I have looked through the forums, and tried changing the "make post/page titles h1" in SEO, but that hasn't made a difference. (I also changed the "meta title tag separator" option as a test, but the symbol didn't change either, so maybe it is a larger problem than just the font?)

Here is my main page: http://poppygallico.com/

Single post page: http://poppygallico.com/uncategorize...bvious-by-now/

I would like to change the title font, the "x comment to..." and the "leave a comment" to be the same as the main page title font, but I cannot figure out where I have to go to change it.

Secondly, I would like to get rid of all the white space outside the borders of the sidebars and central column, so the background image is visible (particularly the bottom of the sidebars that stretch to the bottom of the page.) Is this possible? I would preferably like to have the widgets and posts separated from each other, I'm wanting a blog version of this page pretty much: http://www.nilsfolkevaldemar.se/

If it is really complicated to do the second one (I am not good at the really convoluted stuff) it doesn't matter, I am mainly concerned with the title font issue.

I have the latest version of Atahualpa and WP, and have viewed the page in the latest Firefox and IE.