Replacement Stepper Drives for Replicator 2

I got my hands on a Replicator 2 and the MightyBoard Rev H with a missing botstep and 3 blown BOTSTEP17Es ($50), so I went the Pololu 2128 S4988 Stepper Motor Driver, Black Edition ($6.95) with the 68mΩ sense resistors, which is the version made since Jan 2017.

I took voltage measurements of my working Rep 2s (Mightyboard Rev G & H) and carefully studied the schematic and datasheets of the A4982 (Botstep17E) & A4988 (Pololu 2128) to determine the following conclusions:

1. MS1 & MS2 are giv