First, the MityVac is usually not effective -- I have one, and gave up when it failed to pull fluid effectively. I use the Motive-brand positive pressure bleeding device -- it's very effective.

But that said, you have to open the bleeders one at a time (not simultaneously) -- following the sequence in Bentley. It's time consuming if you have to put wheels/tires on again and again if you only have a jack to support the car in one corner. I suggest getting a set of four jacks, and taking all the wheels off to go around the car more effectively. But that's what you have to do.

And one more thing -- if (as you wrote) you've found that the master cylinder goes to the floor, it's probably already "cooked". Sorry that you've just replaced it, but if it's a rebuild (truly new ones aren't readily available any more), plunging the piston so far in might have damaged the seals, so if it sinks even after doing a good fluid flush, this may be your next problem.

Good luck.