I hope most understand that thesis a Beta and at the moment we don't have any exotics or gear or mods yet. Once the full game releases and etc I almost guarantee some mods will boost the super charge rates etc. If you look at the Dawn Blades perks that we can't access yet you'll notice that a lot of them help with getting grenades faster and getting your super faster. I also found that you need to work as a team in pvp and feed off each others orbs when someone on your team gets a super.