Wow, that's a lot of info.
I know what I have fits well, and the cockpit does not feel cramped. I also know that a top tube any higher would make me nervous. I'm not as stretched as I could be, but I came form and MTB and it feels like a good compromise. I don't think i made a mistake.
FWIW, I'm betting that the MTB shoes, with feet closer together, and inseam number leads to a measurement that's close to the pubic bone (I presume that's the cocyx?) to the floor in bare feet.
Finally -- the bike looks right -- seat is not against the frame, nor crazy high. It's about an inch above the bars.
I guess my point here is that 58 can fit fine up to fairly big folks, assuming that the TT feels right. And it guess I've got shorter legs than I thought.
M