Jimbro. Thanks for the update, sorry to hear you are still fighting this, but glad you are back at it because that means the less pleasant priorities are behind you.
When I went down a similar diagnostic path, I concluded I could not break a line without letting air in and needing to bleed.
If you opened any fittings and did not bleed again, I wouldn't trust any conclusion.
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I started by plugging the front system by pluggng the front outlet on the M/C. That caused the pedal to be rock solid. So I figured the issue is not in the rear system (valid assumption?)
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I'm confused by this. What do you mean by "plugging the front system"? How would that eliminate the rear system? Seems it would indicate rear system ??
And I'm not sure about the air in the master. If you plug only one outlet, I'm not sure you should expect a firm pedal. If you plug both, yes, but I am ignorant about the scenario you describe. I did plug both outlets in my master and pedal was solid, so I concluded my master was bled and not "bypassing" as some had suggested. I don't recall pluggin only one, so I just can't comment. I reconnected both outlets and bled again after that.
Walt says "start over" and I think he is giving you good advice. I think it is unlikely you sucked air into the master, but plugging it up is probably the only way to confirm. I suggest plugging both outlets on the master at once to start. This will give you confidence in the master before you move on.
But after verifying the m/c I recommend bleeding again before doing anything else.
I think there may also be diagnostic guages available, maybe you could rent one from the parts store ?? It may be a pain, but you could possibly get a direct measure at each wheel and reduce some confusion without breaking fittings at the combo valve ??