> One thing I've done is try to be as clear as possible at the end of interviews where someone stands. If it doesn't go well, I try to relate what didn't go well and how it applies to the position we're hiring for.

I tried doing that last time I hired and I think generally speaking makes a good experience for candidates, BUT when you have those 2-3 individuals that have really high opinions of themselves it can get tiring for the hiring manager (myself), because they won't accept the answer anyway and will keep asking and ultimately give some bad review in Glassdoor etc