I always find its the calm cavok days that are the worst. At least with some wind you can shake the a/c around and make it look like it was a tough landing.
Dont sweat it at all, be clear in the knowlage that you will have many more hard landings, even on 10,500' long runways. I still do and have been on the a/c for 4.5 years now. Still not a long time but have had more than my fair share.
All pax are going to have bad days, not sure why the cc let the pax into the flight deck tho.
259.