Thanks for your thoughts, I appreciate them.
I have adjusted vacuum and head height, without change. After making those adjustments, it became clear that the paper was only buckling when reached the point in the exit path where it stopped, so vacuum and head height were not the issue. I thought of reverse curling the paper, and may well try that today, but am hoping that it will un-curl itself as the paper side loses moisture to our now drier air. . . I have also reviewed pages 49-50, without significant new insight, but may get back there after further developments!