I quite like
David Bradley's suggestions above.
Honestly, at the very least I wouldn't change anything until the DRS changes are fully tested. I ran Italy with another account recently and two drivers in the race were changing positions literally every lap. (This may not be a good example, because in Italy once you're past there's no real opportunity to get away unless you use some KERS, assuming car/tire condition is largely equal.)
If anything I'd like to see KERS charge more quickly, maybe about twice as quickly as it does now. Also, I don't think it makes much sense that no matter the league's race distance (25% or 100%), everyone gets the same amount of KERS. Personally, I'd like to see the amount unchanged for 100% race, but adjusted proportionally for shorter distances (racers running 50% distance get half as much KERS time as those running 100%).
Also, this may be a bit of a nitpick, but IMO any changes to KERS should coincide with a wipe-out of the existing race lap records (though the existing records should be saved for posterity).
Semi-related:
Seems to me the main problem is getting bottled up early behind slower cars. In some situations I imagine the updated DRS doesn't help with this, because in the first two laps, you can lose enough time to ruin your entire race. It would maybe be nice to know exactly what factors are taken into account in qualifying, which often can seem entirely random, and additionally how qualifying pace relates to/interacts with race pace. I've had races myself and seen others have races where a driver will qualify well ahead, and then be nowhere in the race for no discernible reason, but I've also seen a driver qualify well ahead and completely run away. I've also seen drivers be abysmal in qualifying, and then slice through the field and dominate.
At this point, I think to help with the issue of getting bottled up, I'd like to see it be possible to change your opening stint fuel load between qualifying and the race. If you set a strategy in pre-race expecting to be on pole and then you qualify fifth, it might be helpful to be able to add or remove fuel to change your pit strategy. Perhaps allow fuel changes but lock the opening tire choice, or allow free opening fuel
and tire choice, but have changing your compound incur a grid penalty of some sort?