I think the common Nema 34 bundled5 with DQ860MA is 3.5A MAX ONLY.
DQ860A is 7amp peak 5amp rms, or 7.8amp peak 5.6rms for those last two settings.. the motor 85bygh450d-008 says 5.6amp. The 60volt psu is 5.85amp. These are cold unworked motors under no load so its not going to burn up coils just in a 1sec jog attempt. I also have this on all 240v so usually less heat, more efficiency and lower amps used on the psu plus higher output by psu.
Im using one 60v psu per motor on lathe so just two motors, two 60v psu per motor. 12v transformer to power the Mach3 Interface board(M3IB), and 5v usb to M3IB to power the 5+ on drivers.
I still think there is something else wrong, not the amp settings or toasting coils.