Blog Layout Template Dramas

So I have spent the past hour trying to update my blog design and in the end I think it looks worse than when I started! :( If anyone can help me to fix the following issues it would be most appreciated:
1/ How do I centre my title?
2/ How do I get rid of the shading at the left and right edges of the reading areas?
3/ How do I get rid of the semi-transparent overlay right at the top which is changing the background colour?

Also, does anyone have recommendations for good complete design sets?

Thanks!