Well, I started over and while I haven't experienced the same issue (yet, give it time)--my save files are at 8megs without issue. I'm going to play without ever stealing anything until the end of the first act. (after patch)

I'm saving like an insane person---I'm wondering if there is a small error that piles up, and after X amount of saves, it becomes too much for the PC to handle.

I think when people are thinking it's a specific person or location--I think that might just be the tipping point for the bug. Because a very specific different person caused my problem originally. Anywho--hope they get this fixed ASAP.