I'm running out of ideas here but that's how would I proceed in your situation
- Deleting repeatedly faulty items stated in the logs
here are the relevant lines
Synchronizer: Sync: createRemote: remote does not exist, and local is new and has never been synced: Resource: (Local 53dc2a9a0ffa4a408b88532343f8fe89)
11-17T12:29:33: Synchronizer: Sync: createRemote: remote does not exist, and local is new and has never been synced: Folder: (Local 1ea901982dc94e65a1ce21b6389095c3)
Can be searched as "createRemote"