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Your problem is in this area:
[*** halfstep section ***]
HsRampStyle 1
HsTimerFlag 1
MaxDelay 2000
MinDelay 600
HsDelayX 1
HsRampX 1
InterruptHs 100
HoldReps 10
HsOverVoltageControl 0
MaxConsecutiveSlews 5
Your MinDelay is probably too short, this controls the max speed of the motor. If the max speed is set too high, the motors can not cope and they will stall (as they apparently do) .
set this var to higher value (until the motors run OK on maximum speed).
Also, you can try to change the HsRampX, set it to 1 (as above), this will result in lower acceleration.
Also, check the power supply voltage, maybe it is too low?
Yes, I have to have some changes, mainly in above area, then to adjust the gear ratio (AltFullStepSizeArcsec and AzFullStepSizeArcsec).
Also I needed to adjust microstep parameters (I am using 24V and my motors are 15V or so) to lower the motor current. But this was done later it was not essential, like HS parameters.
Good luck :-)
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