Problems understanding stepper motor data
When driving a stepper motor, you should be using a current controller. When the motor is not stationary, the winding inductance has most effect on the current, since inductive reactance quickly outpaces the winding resistance. The winding resistance is, for the most part, inconsequential other than due to thermal constraints.

A stepper motor driven with constant-voltage source is thermally constrained at standstill, and will underperform as soon as it starts turning. You shouldn't be driving your motor that way.