Doesn't sound like anything is up with "excess" drinking - I catch my ball python drinking water every week as well. He is not as shy as my corn snake, whom I almost never see drink.

I wonder if it's possible that your BP splashes or tips the water bowl, making it look like urine more? If the liquid is not around the water bowl than it wouldn't appear to be so. Sometimes my snakes like to make a mess like that, even with their stone/ceramic water bowls

But like you said, you have them on paper. I bet most of our snakes go just about as much but we can't tell because of the substrate they are on.