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Sorry about that.
1000 mm/min with a spool diameter of 24mm equals to approx 13 rpm on the stepper.
The drivers are A4988 on a Ramps board (Arduino Mega2560) and the firmware is Marlin with a Delta configuration which has been custom modified. I run with full steps. No microstepping.
The spec mensions that most A4988 knockoffs have 0.1mOhm for the Vref calibration making my set current to approx 190mA. Unfortunately I cannot measure the resistor but it seems sensible. 0.19A is above your recommended max, but I will try to bring it down as I go along.
You are correct that the parameter will change resolution and is directly coupled to the computing power. It would be interesting to find an alternative to the RAMPS which runs faster. Due to the nature of the hanging printer I need two extruders. One is used for the z-axis. This limits the amount of available alternative boards unfortunately,