Did you report the speed issue you were experiencing in the Sprint Zone App? You still do it manually, even without the GPS auto-location.
Sprint launched a Triband DAS at Kauffman Stadium earlier this year, which I'm sure improved speed/coverage substantially.
ICYMI: some interesting news about Kansas State's Football Stadium getting a new DAS and Public Wi-Fi Network.
There are a lot of politics involved in getting a DAS installed. It takes time, and some factors are beyond Sprint's control. While improving the Macro network is more within Sprint's control (there are still politics/permits, etc), you can help by providing issue reports.