Reid, I know what you mean about the knowledge base here; it's amazing!
I understand about wanting to try anything else after the normal methods don't get the results you want.
I'd suggest carefully pinching off each hose (LF, RF, rear) and trying again. I bet the pedal gets nice and hard. Often, the adjustment isn't as good as it could be since no one arcs shoes anymore. The hoses can get a bit spongy after time too. Another method I've seen to get that last bit of air out is to tap lightly on calipers to get all the air bubbles clinging to the sides to break loose and rise to the top, then gently bleed them out. Good Luck!