First up I tried sharpshooter for pvp, then decided to give saboteur a whirl, I found it alot better with saboteur as I could run around more whilest still doing DPS with shockcharge and autoattacking.
Also I found the AOE alot better in saboteur as you have incendiary grenade/sweeping gunfire/XS freighter.
using cover in PVP is quiet difficult because you get marauders force charging at you