Start with a low Startvalue and very slow acceleration then observe the motor by programming a move of a few inches travel.
If the motor starts smoothly then slowly accellerates to speed you got good values to start further tests.
If you get a quick jerky start you need to reduce the startup value.
If it starts extreamly slow you increase the value.
Observe acceleration programmed Feedrate should be reached within a few seconds.
If the accel. is very fast increase the value, if too slow decrease.
When good starting values are found, setup a Dial indicator and run it against a solid stop, set the indicator to zero.
Now edit a small program that will back off the indicator a few inches then drive it back to the same Position previusly Zero'd.
You now have a test program that lets you test if you are loosing any steps durring execution of your program.
Run this a few times verifying that it positions back to zero.
Now increase your Startvalue untill the highest number that dose not loose steps is found. Then do the same with the accel. values.
When both values are found reduce them by 15%-20% for reliability under load.
Retest this again the next morning when the Machine is cooled of and oil condition is adverse to ensure reliability.
May even add some weigth to the table to simulate working conditions.