Summary: The warning is nothing to be worried about. 
The “Large JSON response” warning is an indicator that the response size is getting near the limits of the Hubitat Cloud Relay when trying to sync over devices. It’s usually nothing to be concerned about as the system will automatically retry syncing a smaller batch of devices if a batch fails.
The system will automatically retry down to a batch size of 1; eg. syncing an individual device. If it fails to sync the individual device after 3 tries, it will skip that device. This usually only occurs with custom device handlers that are either storing too much data or have some implementation quirks. This results in that device being missing from SharpTools - if you ever run into that case feel free to reach out to support@sharptools.io 