I would say change the "width=540" in your URL. That's what sets the size it captures.
It appears there is no way to edit the link through Ambient so I had to delete the camera and add it again and wait for it to be approved. I played with the numbers and found that if I went lower the image appeared worse. Currently it is at 1000 which seemed to be the max input for that parameter, anything higher and the link did not work. The image did improve considerably from what it was. We are currently in the middle of a snow/sleet storm so the lens has some moisture on it, but it looks better.
Do you think that is the best I can do with this camera?