All races pass the same,all drivers(me too) keep all the kers to use in finish lap to make a fastest lap.
i think the solution is eliminate KERS, like F1 now, and driver automatic waste his battery in every lap(charge and waste in every lap)
and maybe more interesting too, put in car points a new options
Acceleration - Fuel Economy
Brake - Handling
Cooling - Reliability
Downforce - Tyre economy
and put Hybrid system( recharge more o less battery to use in envery lap) and maybe should be interest put "Traction"
to have more options to upgrade your car