what would be your diagnosis?????

Zinc additive in the oil during break in? Cam lobes get wiped out real quick if no zinc is in the oil during break in.
It looks like you have at least 1 dead misfire. Have you done a cylinder power balance test to identify what cylinders are affected?
Double check the valve adjustments again.
Make sure the power valve in the carb isn't kaput or the wrong calibration as this would make it run too rich.