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The amazing DRV8825 driver carrier has a similar flaw, strange jumping of steps in 32th micro-stepping mode.
After doing a bit of research, it seems that we need to put the chip in FAST decay mode, by pulling the DECAY line of the chip to 5V. Luckily the DRV has exposed pins, so I carefully soldered the DECAY pin (19) to the M2 pin on the board (will be 5V when 32th uStepping is enabled.)
After giving up on getting any reprap related spares anywhere in South Africa, and after commissioning the making of the circuit-boards for my RAMPS and stepstick boards, I found a little computer store RIGHT ON MY DOORSTEP that stocks amongst other things, Pololu stepper drivers, Arduino, Sparkfun stuff, the elusive headers etc.