Mad Dart;
I read through your posts, looked at the photos and re-watched your videos. I am no expert by any means but that motor had NO miss fire in the first video. It was slightly detectable at the end of the second and down right awful in the last. My thought for what they are worth are you have a crap distributor that really started to break down in the second video. I think the tuner tried changing things to correct the issue and that just made it worse. I think a good distributor and putting the specs back to where they were in the first video will cure your problem. I do however like the idea of using the COP system. Will continue to monitor your progress and wish you the best of luck in getting it repaired.
~Michael