How to force a Time Machine deep traversal?
Setting the Time Machine destination to nothing and then re-setting it to the same location as before forces a deep traversal for me. You could try rebooting between the changing of the destination and the re-adding it to increase the chance of a deep traversal being triggered. 

Worst case, we could muck about in single user mode to destroy the fseventsd directory at a safe time when the system is not counting on it to be correct, so you have forced a new database that won't match. You could presumably delete this from the TM side, but I would remove the boot copy as marginally safer and less prone to destroying data you need or messing up your backup.

If you're inclined to use the command line / terminal, I'd start with tmutil compare before you even thing about forcing a deep traversal. It explicitly compares things as they exist now to the last snapshot and you can force things by specifying a specific external snapshot if you are worried about a local snapshot being compared.