Any issues with this combination of parts is likely the result of a less than smooth cable path to the rear derailer.

Often as not, the rear-most loop of cable housing, together with the cable guide at the bottom bracket, are where big improvements can be found when the cable is once again sliding against clean polymer surfaces with proper cable-specific lubricant on the cable.
There is also the common issue of one or more strands of the cable itself having broken, at which point the cable becomes less smooth and more springy as well, neither of which contributes to crisp shifting response back at the rear derailer.

Be sure also that the cable pinch bolt and washer are directing the cable through the groove in the arm that the bolt threads into (one more thing that can also greatly affect indexing accuracy).