So... the 9:00 moment.
This was years ago, but here's my recollection. There was actually a delay of one day between those before/after moments, so that's me and Chad and Justin, with the rig, into the evening, making new mixes of the IRs we'd shot. Chad would have been the golden ears on that session, since he seems to have an invisible network cable between his head and Het's. Then, we did a tone match between the "accurate" live rig and the "adjusted" sound, and used the tone match AMOUNT control to set its desired impact. I forget, but I think "Amount" is printed into the IR that gets exported from the tonematch block -- meaning that our final step after the "YES" was to serially combine that "adjuster" onto the individual left and right custom IRs.
When I called Cliff, I always remember thinking I sounded like Luke Skywalker on the radio to Threepio after the trash compacter was shut down.