Clark,
The timbers are boxed-heart.
In a couple of the timbers that twisted badly, the heart did not run down the center of the timber. Instead, it might run from the lower-left corner on one end to the upper-right on the other. I think that was a big part of the problem.
But, as you said, most of the BH timbers were a little wild.
It's just another of those things that I'd do differently "next time."
Thanks for the reply!
Jon