Good article, Jake. I am surprised that in the beam seating process, you never checked for hull alignment before letting the slurry cure. In talking to Pete Melvin, he told me that he prepared the slurry for all four pockets, similar to your process, but put both front and rear beams in place, checked that the measurement from port bow to starbord stearn was the same as starboard bow to port stearn. This is when he tightened it all down at all beam bolts, then checked again to make sure nothing moved. He let it cure in a perfectly aligned position.
By doing the process for the front beam at a different time than the rear beam and with all the slurry it took to take up the imperfections of the beam seats, I would be concerned that you might have cured your new beam seats with the alignment less than perfect. Just a thought.