Micro stepping is only a type of electronic "Hocus Pokus." A stepper motor has no detents for micro stepping. The only detents are for the 200 FULL steps. The motor will always stop on the nearest full step.

I wouldn't worry about it. Since 2.5mm is a full revolution, 2.5/200 steps= only .0125mm deviation. (0.0004921 inch.) Actually LESS than that because the jog stopped somewhere in between.

CR.