hi I wanted to reply to this thread as I had the same issue with a number of brand new leviton zwave plus switches - the key is not just to follow the instructions to exclude, which I did 10 times, on the newer ones you need to KEEP holding the paddle up for quite a bit longer before you will see a series of red flashes, this seems to be a “real” factory reset, this fixed all my issues once I re-added the device. and yes on both the zwave and zwave plus leviton switches I have (DZS15 and DSZ15s) there is a 1-10 second delay to register the status to the hub when when physically pressing the switch - you get used to it 
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