Topper awning collecting rain water = annoying

I had topper awnings installed on the slides by a large dealer a few months ago. I love the awnings but the larger one collects rain water and cups down so that the water has to be pushed out prior to closing the slide. It's a good bit of water that falls out. The smaller one doesn't do that at all. Is there some kind of tension adjustment that will keep the awning taught during heavy rain? It's quite annoying, especially with the amount of rain we're experiencing in my travel areas these days.