As I mentioned earlier, this issue was part of the process of fixing the blown master. That is to say, I replaced the master, installed new (speed bleeder) valves, and ran a liter of new fluid through--twice. Once at once, the second time a few days later. This was one month ago.
The brakes just never quite returned to how they were before, they never were good, and I had planned to attempt to make them better. But now with the ABS light on, and the brakes softer than they were before the master blew, I'm tackling the issue little by little till it is solved.