Those cylinder balance numbers look good. An obviously bad cylinder would have little or no RPM drop, and the vacuum wouldn't change much. Since the cylinder isn't making much power, killing the ignition won't make much difference in the power it's producing.
Just for grins, before you start swapping parts, rig a small gas can to the fuel pump with a piece of flex tubing, and see if the performance improves. I've done a bunch of test drives with a lawn mower gas can on the front floorboard and a long rubber hose out the window and over the fender to the fuel pump.
Jerry
