I feel like overall Super charging is a tad slow. However in PvE I'd say the best way to tweak it is not to decrease the charge time but increase the reward for kills. In PvP I'd like to see the reward for kills removed. Doesn't make much sense to have the team or player that's crushing the opponent be able to do that easier. Instead maybe decrease the overall charge time and have a designated round where all supers go live and players can hold onto them for later if they wish.