[kjs3]

I was a bit frustrated because I believe these reasons are not sufficient for declining a candidate who is well-suited for the position.

They aren't obligated to give you the job and the decision makers did think there were sufficient reasons to pass on you. Unless you think there's some protected class bias, chalk it up to "live and learn". As a hiring manager I've certainly walked out of many, many interviews and said "candidate is technically qualified, but they aren't a fit" for many legitimate reasons.