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Must actually be having a Senior Moment. I re-read the jumper mapping one more time and I was correct originally. If no jumpers are installed then the stepper should be doing full steps.
So it is still a bit strange. With the drivers configured for micro stepping I was able to get the Z Axis working at a higher seek rate but something is still a bit funky, so I’ll have to do some more digging and wait for the RAMPS board to get here.