DM860H driver and NEMA 34, 6 A, 8.5 Nm - configuration

I am new in this field, I made my own CNC router and I am using AXBB-E controller with Mach3.
When I want to start again same program, tool is not going through the same toolpath as the previous one. It is always different path and it makes me huge problems.

I think, problem could be in this relation between driver and NEMA 34 motor. So, could someone provide me what is the best choice for the current on the driver and what are the best options for the motor configuration in mach3?