Rwdata full even numerous soft resets done and the rw data cleaner tool used

This is very interesting, thanks for sharing.
Do you have an approximate success rate %?

Please do and share your results, because we may include it in the troubleshooting thread for this issue ( APIM Sync Settings Not Saving, VER_ERR08 Errors, Cannot Perform Master Reset or Upgrades/Updates (Solved) ) as yet another workaround.