I picked a random address near 32nd and Catcus, and the web soil survey shows that the native being versions of what I believe to be sandy loam.
But, you have to always ask yourself, how much non-native soil, or how much was ground turned over when the land prep for your development, or even the soil added with your BOB sod?
That being said, it looks like you also have the brand new feature enabled, which makes the crop coefficient a dynamic setting that adjusts throughout the year. This is a pretty ideal concept, but being brand new, we are all curious to see how it performs. This could explain why you feel it is watering more frequently this year…