Rep has come out and said Searing is bugged, it's increasing DoT damage by 30% overall instead of crit only, if they fix it it will be a nerf to Watchman, not a buff.
So you should actually HOPE they delay it as long as possible.
@ lv 20 you don't even have most of your key rotation skills, you can't judge based on that.
That said, Sens and Guardians are not easy class to play in pvp, roll a Trooper/Sage if you want a easier time imo.