WEBSITE EDITING:
From your post, you need the website to be adjusted to Increase the width of the main area so that advertising header fits nicely, more posts should be loaded on the homepage and the right column should be increased to fit a 300px width.
Since I am proficient in HTML5,CSS3 and JAVASCRIPT,I believe I am the perfect fit for this project. I have worked in similar projects before and I love playing around with CSS3, which I believe will solve your problem.
I will go through your source code and identify the classes that directly affect the location of the adverts,. I will also use javascript scripts to ensure i enhance the responsiveness of your site.
Please contact me for further details.