Joel,
I found this in the forums here from James. I think it will take you all the way back to the latest non-beta firmware. Maybe it will help you figure out the accuracy issue. — Duane

“Roll back to older android app version:
Yes, you can leave the beta program and reinstall the app from the google play store. The link to enroll/leave the beta is here:
https://play.google.com/apps/testing/com.mooshim.mooshimeter
Note: if you upgraded your Mooshimeter firmware, you will need to downgrade it to work with the older app version.”