The delivery of the replacement tube took longer than expected, but it arrived yesterday and was installed forthwith. Of course, I forgot to use talc, but I think that's okay at this point.
http://www.dropbox_dot_com/s/48aqpr5...cer.JPG?dl=raw
replace _dot_ with a period/dot
The image above is of one of the 3D printed spacers I used to reduce the problem, along with reducing the maximum pressure, currently at 40 psi. With the spacers in place and a single rim strip, there are no bumps along the entire rim. It may be overkill, but it works and it's easier to leave it in than to remove it at this stage.
Thanks to everybody who contributed to my quest and my question.