Ultra Sports have about as little flat protection as possible, so don't be surprised if you keep getting flats. They're designed to be lightweight and fast.

At the risk of sounding condescending, how much effort to you make to steer around cracks and sharp-looking things, and to get out of the saddle when encountering bumps? (If you're rolling over everything like a sack of potatoes and not paying attention to the road, well, that's not good for tires or rims. )