Have a look at this tag wiki article and questions in tag master-details for related patterns.
Varying the Area Allocation
The key problem you have here is that questions and answers are competing for space. It's a trade off, and it's not a fixed trade off. Sometimes answers will be more important, sometimes questions.
To solve that I'd make the boundary between the left and right draggable so the user themself can choose to see more-questions/more-answers on a page. I'd also make the question height draggable up and down, so the user can see just the question, question+who, question+who+when, question+who+when+start-of-best-answer, question+who+when+best+answer+tags. I'd additionally move the tags above the first answer. I hope someone else can give an argument for or against moving the tags higher. For me it just feels better.
I've used that variable-height approach to master-detail to control how much of the detail to show on search results from a protein database search. It turned out that there were two levels of detail users liked best - corresponding here to question and question+who+when, and they would toggle back and forth between them, using the most compact format to scroll and scan quickly. That experience suggests that by default you should in fact move the first answer to the right column, along with the other answers, as that will allow faster scanning of the questions.
Distinguishing The Columns
I'd also work at distinguishing the two columns more. At the moment with peripheral vision they have near identical appearance, bar the color tie. With more distinctiveness it will be easier for the eyes to switch back and forth between questions and answers.