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I do not know all the specifics of your system. Obviously, you have considerable time invested in research and problem solving. I had a similar problem on an original car, and read in Carroll Smith's "Prepare to Win" book that when the master cylinder is below the calipers, solving the soft pedal problem after thorough bleeding can often be as simple as installing a 2psi check valve between the MC and whereever the feed line breaks into serving the calipers.
I did this, and have solved my problem. I hope this simple answer might be the trick for you. Good Luck! Bob
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