This concern is more of PvE than PvP so here we go:
I don't know about the rest of the snipers here, but I tend to have issues with running out of energy in PvE. This occurs when I need to dps a hard mode Flashpoint boss before the enrage timer goes off. I use all my heavy hitting abilities, then use adrenaline probe to get energy, but then I'm left with no energy and my dps just goes down quickly at the end. I tried using said abilities and then rifle shot, in order to prevent a huge chunk of energy wasted in a few short seconds., but feels like my dps isn't enough compared to when I'm bombing away with all my abilities.
Usually the group I'm in kills the boss when the tank dies at 5% and it takes a few more shots to finish the fight. It's frustrating just standing there waiting for the energy to fill back, it's dps that could had been made during that time interval of the fight.
Snipers have good damage dealing abilities, that I don't complain about, but the energy is what's killing me to be honest. Anyone have suggestions or ideas?