Cutters Cry scale mail > Sunken Temple heavysteel > Brayflox Cavalry > at-level quest gear (what you have now)

Your gear (mostly level 40 whites) is adequate, at-level, exactly what Stone Vigil was tuned for. Note that often times the Heavysteel with proper stats (parry) will out-perform bone scalemail with dps stats.

Obviously you can get better gear, but that's over-gearing for Stone Vigil. Just make good use of your cooldowns (stun included) and avoid all AoE damage (don't use stun to interrupt casts unless you can't avoid it---the time a mob spends casting something that can be avoided completely, is time the mob doesn't spend on attacking you; use stuns when the target is not casting something).