We've had problems with water pooling on ours , however by accident this summer I put the awning up in a bit of a rush with the result that the front of the awning was at a steeper angle, ie the front edge of the awning was lower.
This meant that the slope on the roof was steeper and for the first time never had any problems with water pooling despite two weeks of torrential rain.
Not sure if this will help but it appeared to work for us.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.