Hi @pswired!
think of the RainCheck on/off option as a toggle for the display only. The data is always run and stored, the switch just determines which value is displayed. That means that you can turn it off with no negative impact to its availability for device calibration.
Thanks for the report! We are seeing some slowness in the data getting out to the apps for some stations. It will all fill in soon and we are working on improvements to keep it speedy going forward.