Secondary inspection happens to many of us, including US citizens. When I went to visit my now-wife for the first time in Colombia, 15 yrs ago, I wasn't very smooth in answering the questions about the purpose of my visit at the initial passport inspection. Off they sent me to secondary inspection to ask me many more questions.
I would guess that the info they put into the system about your uncle, etc., was at the discretion of the officer asking the questions. I wouldn't worry about the time differences as related to your answers. CBP handles international time discrepancies every minute of their jobs.
I would never call secondary inspections pleasant but based on what you're telling us I would guess that you're fine.