I run with Dropbox with Bonjour “on” on the iMac that I think of as the server. I have the MacBook, iPhone, and iPad running both Local Sync (with accept Bonjour connections “off”) and Dropbox (2 tb paid-for personal account). Both syncs in DEVONthink and DEVONthink To Go are set for Automatic
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I recently added Bonjour sync and we had conversation about frequency of server busy etc messages. Like you I set up Bonjour with my iMac as the server and MacBook as the client. But I notice you say your MacBook has Bonjour Incoming connections OFF. After setting mine up to the instructions (I believed) I see my MacBook Incoming connections is ON. iPhone and iPad are OFF. I have just turned this OFF on the MacBook. Did you turn your MacBook to OFF after setting up or did I do something wrong?