Please post feature requests to the Github repository under “issues”:
Yes, the Android app is definitely still a little rough. The nice part about software is that it can be updated easily, expect it to improve soon.
Error status 133! I’ve been battling that as well. Unfortunately that status simply means “GATT_ERROR”, which is the almost most generic error code available for the bluetooth low energy stack. It seems to indicate stack instability but it’s unclear where. Anyway, working on it, more soon!