Why would you want 4.4.2 drivers on 4.3 other then benchmark scores?
Simply use KitKat?
And who really cares about benchmark scores on a 2 year old device?
Getting higher benchmark scores mean very little. It was stated that Samsung had implemented functionality in the firmware that would give preference to benchmarking apps and increase performance to enable higher scores. It proves very little to be honest. You notice performance in day to day activities.