Hi, I have seen your blog. It's nice. I suggest you two option for placing ads. (1). 160x90 ad-block, which you have kept in right sidebar, is not ok. Keep this block (160x90) between Blog Archive and about me section OR (2). If you dont want to change 160x90 ad-block, then remove top square block (336x280) and keep it in between two post
ad placement is as expected , start adding more units after few months when your content has increased