Changing settings to get better localization results

I bought a 4 UWB Dev kit and I get very bad results in terms of indoor location - there are a lot of variations even if I stand still.
I tried changing the Estimote Location settings in the cloud app (setting Broadcasting power to 20) but the results are not consistent. At first they are saved but after a while the Power is set back to 4 (which was the default).
I tried syncing with both Estimote deployment app and Estimote app but the Power value is still 4.

How can I get better results for indoor location?