My kids gave me a Sav Bing's Favorite a few years ago, and it's one of my favorites. I'd definitely like to straighten the stem, not because it bothers me (it actually feels very good), but to make it a bit more "Bing". Interested in what you find out about straightening it and what your issues were with the first two. Mine's a great smoker and have had not issues with it at all.
That's why I want it straightened too. Not that I don't like the curve, but Bing was never photographed (that I know of) smoking a pipe with a curved stem. I don't know why Savinelli would make a pipe and call it Bing's Favorite with a curve in the stem.