The backlash is odd.
It starts, stops, starts, stops and then finally starts again. The second start is controlled by the backlash speed or % input and as far as I can see the other starts must be dependent on the speed your want the axis to travel (G0 or G1 F**).
I think the logic is - start the axis - which way is it going -
Then it is either the same way that it was going, in which case it continues uninterrupted, or the machine finds the axis travel is reversed, in which case it stops the axis,(perhaps both axis) applies however much backlash travel, at whatever % or speed, then stops again, then carries on with the move.
I have mine simply set at 50% - with the idea that all the acceleration and deceleration could cause it to miss steps.
Having said that - although it sounds a bit rough, it is accurate, and turning some ball shapes on rods - I couldn't see the join where the backlash had been applied