Wanted to drop in an update that the test drive was mostly a bust. Same hesitation was happening, apparently in the places where dwell begins near a TDC / low res signal (i.e. around 90, 180, 270 degrees of dwell). 0.9.12 exhibited similar stumbling but it was much less pronounced. If you accelerate past that range it runs great. So more work is needed there.

Hope to have it back together and running before the end of the year but I might try building a test rig out of my spare opti so I can at least attempt to make some progress while the car's out of commission.