My understanding (admittedly third-hand) is that a lot of the edits were made by Sondheim himself, who continued to fiddle with it after the first production.

But yeah, sympathies: I'm familiar with imprinting on one's first production, and being twitchy about the differences in other ones. Evita is the worst for me: I learned it from the Broadway run, and later wound up with the album of the original West End run, and the differences drive me *nuts*. I can only imagine how much worse that would be having been in a show a couple of times. (The only shows I've been in were classics, which tend to vary less nowadays.)

I'm curious: what was the twitch with Franklin Sheppard Inc? I thought it was quite effective, but I only know the show from last night...