Backlash , Any suggestions ?

[JAZZCNC]

There is one thing you can try that does happen and will cause a missed step on each directional change.
This happens when the Step Pulse is sent out on the wrong pulse edge to what the drive is set to expect. Resulting in the drive sees the Step pulse at the wrong time and one step or micro step is dropped on every direction change due to the fact step pulse comes before the direction pulse so it gets dropped.

This is easy tested by knocking some G-code to move each axis back n forth 1000's times then returning back to start. Make a mark before running and see if it returns to same mark after run the test.

If it doesn't then you have the Pulse edge set wrong. Easy fixed by changing the Active Lo setting in Motor tuning. ( Or some drives have a setting for this) This will then make your motors turn the wrong way so you'll have to go into Homing and limits and use the Reverse axis option.
People Often make the mistake of thinking swapping the Dir active low is for changing axis direction when it's not. It does but it's not correct way.