"Looking to buy the "tightest fit" tires is only going to make flat repairs more difficult, not provide any more security. "
No one said looking for tightest tires to buy. I would like to know which tires fit tightest. There is a difference.
As yet, arguing the question, but no answers.
As replied to another, I have experienced as others have posted online tires that not fit. 700c tires on 700c rims. Touring tire on touring rim. Modern hook rim.
I am not interested in arguing your experience. Your experience, vast as it might be, is minute, I'm sure, compared to all other bicyclists.
If you or others on list can provide answers to question, thanks; if not, then, for me, it was tried here, go on to other venues.