Interesting point about the weighted pullups. When I do them, I use around 100#. It's never bothered me though; the traction actually feels a little nice.
I go to a chiro once a month, but it's more for the SI joint stuff. Since this came up, I'm going to look into it a bit and see if there's a connection.
I'm sure that football, rugby, and judo have taken their toll, as well. I've known about mine for almost 20 years--when I first tore some back muscles in junior high--and, like I said, some days it just doesn't work no matter how much stretching I do. Yesterday was one of those days. Light snatches, nice metcon, and I was FUBAR by judo. Some days are better than others. However, I'm convinced that heavy heavy squatting, deadlifting, and trunk work have helped, rather than hurt, the situation.
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